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MPG and setup by IndygoEEI
Started on: 06-12-2010 06:55 PM
Replies: 39
Last post by: 17Car on 06-18-2010 10:46 PM
IndygoEEI
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Report this Post06-12-2010 06:55 PM Click Here to See the Profile for IndygoEEIClick Here to Email IndygoEEISend a Private Message to IndygoEEIDirect Link to This Post
list it.
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Report this Post06-12-2010 11:12 PM Click Here to See the Profile for Fiero1KClick Here to Email Fiero1KSend a Private Message to Fiero1KDirect Link to This Post
Very consistent 21.5 MPG mostly driving for fuel economy, split between 55 MPH country roads and sorta-city driving (not stop-n-go, more like stop every once in a while if out of sync with the lights). On an 88 5-speed duke. I feel that either my EGR or O2 sensor, or both, are ruined, since people consistently get better numbers with 2.8's.

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1988 Metallic Red Pontiac Fiero CJB T-Top Coupe, # 784 of 1252

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jgrotzin
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Report this Post06-12-2010 11:19 PM Click Here to See the Profile for jgrotzinClick Here to Email jgrotzinSend a Private Message to jgrotzinDirect Link to This Post
Check your plugs, and or coil packs. The 88 duke ignition is very sensitive, it likes regular plugs and good working coils.

Same setup here 100 miles daily, average about 30-35 usually on the higher side, as soon as it drops below 30 I start looking into things. First place I start is plugs, the cheapies work great!
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Report this Post06-13-2010 12:31 AM Click Here to See the Profile for Fiero FinaleSend a Private Message to Fiero FinaleDirect Link to This Post
Yeah I would definitely check out your engine as I'm average about 31-33ish mpg with a decent mix of city/highway. Mine is also a '88 5-speed 2.5

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1995 Pontiac Firebird - 3.4 V6 5-Speed (Engine outta commission awaiting V8/6-Speed swap someday), 93-97 to 98-02 Trans Am body conversion My Firebird's Cardomain Page
1988 Pontiac Fiero - 2.5 I4 5-Speed My Fiero's Cardomain Page

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ekinodum
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Report this Post06-13-2010 12:57 AM Click Here to See the Profile for ekinodumSend a Private Message to ekinodumDirect Link to This Post
I just got back from a 3500 mile drive where I averaged almost 37 mpg- I usually get 32-34 on the highway and never less than 31.
Stock '88 duke 5-speed with 118,000 miles.
In my '87 duke (also stock with about the same miles) I get 29-31, but it is definitely not running perfect, and it smokes a little.
If you are only getting 20 mpg, there is something seriously wrong, and I don't think it is just plugs.
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katatak
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Report this Post06-13-2010 01:20 AM Click Here to See the Profile for katatakSend a Private Message to katatakDirect Link to This Post
88 Formula - 2.8/5 spd - all stock with cat. Averages 27.6 on the interstate @ 80 plus. Averages 31 @ 65 to 70. around 24/25 in town - traffic - stop and go.

88 Coupe - Duke with auto - would get close to 33 on the interstate 65 and below - over 65 28 and less as speed increased. 23/24 around town. Now has a 4.9 with the 4T60E auto and is getting 23/24 around town but I just found out that it's only getting about 1/2 the pressure it needs so it's been running lean! It will most likely drop to 20/21 aaround town with the proper fuel pressure.

86 Coupe with a carbed 350 SBC / Econo 4 spd. It gets about 16 driving easy - 12 or less light to light!
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Jake_Dragon
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Report this Post06-13-2010 02:00 AM Click Here to See the Profile for Jake_DragonSend a Private Message to Jake_DragonDirect Link to This Post
2200 5 speed, last time I checked I was getting 24 mpg. I need to get the thermostat installed and see if that helps. But my other cars get 9 mpg so its pretty nice when I drive it.

[This message has been edited by Jake_Dragon (edited 06-13-2010).]

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Dougie Murder
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Report this Post06-13-2010 04:43 AM Click Here to See the Profile for Dougie MurderSend a Private Message to Dougie MurderDirect Link to This Post
23MPG 85 GT stock 2.8 4 spd (only mod is the ocelot exh from the Fiero Store)
Mostly highway driving. I'm Cleaning up the engine now and replacing the ignition components among other things. Should help performance, maybe mileage too.

[This message has been edited by Dougie Murder (edited 06-14-2010).]

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87antuzzi
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Report this Post06-13-2010 04:56 AM Click Here to See the Profile for 87antuzziClick Here to Email 87antuzziSend a Private Message to 87antuzziDirect Link to This Post
14-18.....Its how I drive....2.8 auto
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LT188GT
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Report this Post06-13-2010 10:36 AM Click Here to See the Profile for LT188GTClick Here to Email LT188GTSend a Private Message to LT188GTDirect Link to This Post
18/23
Six spd
Worked over LT1
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fyrebird68
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Report this Post06-13-2010 10:42 AM Click Here to See the Profile for fyrebird68Click Here to Email fyrebird68Send a Private Message to fyrebird68Direct Link to This Post
25-27 mpg 50/50 hiway and city dirving. 3.4 PR with Getrag.

It's my daily driver.
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N3M3S1S
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Report this Post06-13-2010 11:06 AM Click Here to See the Profile for N3M3S1SClick Here to visit N3M3S1S's HomePageClick Here to Email N3M3S1SSend a Private Message to N3M3S1SDirect Link to This Post
20mpg's on a stock 2.8 with an auto. Has all kinds of things wrong with it right now, so I'm surprised it even gets that. Mostly highway typically doing 65 - 70 to work.
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darkhorizon
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Report this Post06-13-2010 11:13 AM Click Here to See the Profile for darkhorizonSend a Private Message to darkhorizonDirect Link to This Post
3800 turbo automatic

E85 18/25
E10 28/38
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Report this Post06-13-2010 11:14 AM Click Here to See the Profile for Jake_DragonSend a Private Message to Jake_DragonDirect Link to This Post
 
quote
Originally posted by N3M3S1S:

20mpg's on a stock 2.8 with an auto. Has all kinds of things wrong with it right now, so I'm surprised it even gets that. Mostly highway typically doing 65 - 70 to work.


Thats not bad, I was getting 18 with the same engine and a 4 speed. I have a lead foot
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N3M3S1S
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Report this Post06-13-2010 11:19 AM Click Here to See the Profile for N3M3S1SClick Here to visit N3M3S1S's HomePageClick Here to Email N3M3S1SSend a Private Message to N3M3S1SDirect Link to This Post
 
quote
Originally posted by Jake_Dragon:


Thats not bad, I was getting 18 with the same engine and a 4 speed. I have a lead foot


Yeah? Back in its lower mileage days it got about 25. Right now it needs the egr tube, o2 sensor, and tjuneup items replaced. It's also running pig rich right now, I almost get a high sitting at idle with my windows open. Gotta figure that one out. Also my brakes are spongy as hell. All in all I've been neglecting the poor girl due to a chaotic past couple months. =/
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silver 85 sc
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Report this Post06-14-2010 07:41 PM Click Here to See the Profile for silver 85 scClick Here to Email silver 85 scSend a Private Message to silver 85 scDirect Link to This Post
On Dell's run got about 34 in my 85 2.5 coupe auto with a 35 mph head wind. Typically get 38 highway and 28-30 city. Have seen as high as 40 highway.
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fieroguru
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Report this Post06-14-2010 08:36 PM Click Here to See the Profile for fieroguruSend a Private Message to fieroguruDirect Link to This Post
2.8/Isuzu: 25-28 on daily commute, up to 32 on steady 75mph.

4.3/4T60: 24-27 on daily commute, up to 32 on steady 75mph.

SBC/Getrag: 15-17 on daily commute, up to 22 on steady 75mph.
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blackrams
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Report this Post06-14-2010 10:24 PM Click Here to See the Profile for blackramsClick Here to Email blackramsSend a Private Message to blackramsDirect Link to This Post
Well, I don't think anyone believed me but, I had a 88 Coupe, 5 speed car, A/C delete that I could get 45+ mpg on highway trips driving 55 to 58 mph. Steady state driving over long distances. That coupe now has a 3.4 with the same Isuzu manual in it. I haven't checked the fuel efficiency yet but I expect to get mid thirties.

Ron
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Capt Fiero
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Report this Post06-14-2010 10:44 PM Click Here to See the Profile for Capt FieroClick Here to visit Capt Fiero's HomePageClick Here to Email Capt FieroSend a Private Message to Capt FieroDirect Link to This Post
88GT 2.8 5spd MSD Ignition, New Injectors, Ported everything. (Heads, Exhaust, Throttle Body, Intake Manifold) Mild Cam, decked heads to increase compression.

Now this one is a hard one for people to believe, however everyone in the local club saw it and saw me driving, on our last major club run, I averaged 90mph, with trips to 121mph, towing a trailer. (Video and Pics to prove it) I averaged 30mpg.

Running empty with just me in the car on steady highway I routinely get 30-34mpg.

In town with a lead foot and lots of trips to 5000-6000rpms usually results in a respectable 25-28mpg.

This is probably the best running 2.8 I have ever owned. I have had 4 or 5 different 2.8's and for some odd reason, this one is great on gas, performance is above average. Here in BC where our gas prices are usually pushing $5 per gallon, we do all we can to keep our engines in top running condition.

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85GT Soon to be 87GT,93 Eldorado 4.9, 5spd Dual O2 Custom Chip, Custom Exhaust. MSD Everything Capt Fiero --- My Over View Cadero Pics Yellow 88GT 5spd Full Poly Suspension, Lowered 1/2" in front, Corner Carver.

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carbon
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Report this Post06-15-2010 12:18 PM Click Here to See the Profile for carbonSend a Private Message to carbonDirect Link to This Post
27.8MPG all highway at about 70MPH... 1988 GT 3spd Auto... on the way to the Dells... must have been some good gas.
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Report this Post06-15-2010 01:06 PM Click Here to See the Profile for ls3machSend a Private Message to ls3machDirect Link to This Post
88 Formula.
LQ1 mated to a 5spd getrag.
25.67MPG last tank, driving like a shithead. I will update after I fill up later today, if I get the car out.
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Report this Post06-15-2010 01:27 PM Click Here to See the Profile for topher_timeClick Here to Email topher_timeSend a Private Message to topher_timeDirect Link to This Post
84 SE 2.5/4 speed about 6 mpg city/highway. Lowest was 4, highest was 9. I really need to figure out what is wrong with it.

[This message has been edited by topher_time (edited 06-15-2010).]

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northeastfiero
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Report this Post06-15-2010 03:00 PM Click Here to See the Profile for northeastfieroClick Here to Email northeastfieroSend a Private Message to northeastfieroDirect Link to This Post
 
quote
Originally posted by topher_time:

84 SE 2.5/4 speed about 6 mpg city/highway. Lowest was 4, highest was 9. I really need to figure out what is wrong with it.



Possibly a hole in the petrol tank
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FieroMonkey
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Report this Post06-15-2010 03:05 PM Click Here to See the Profile for FieroMonkeyClick Here to Email FieroMonkeySend a Private Message to FieroMonkeyDirect Link to This Post
3.0 Superduty 4 cyl / Getrag 5-speed 11-25 mpg depending on the weight of foot

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Report this Post06-15-2010 03:22 PM Click Here to See the Profile for ALJRClick Here to Email ALJRSend a Private Message to ALJRDirect Link to This Post
Interesting this just came up; as I was wondering waht the heck is wrong with my MPG!

First, I have an 88GT manual
Brand new rebuild, everything new (still under 500 miles)
Stroked to 3.1L
272 cam
FPR set to 45psi
Total seal rings
Port/polish intake/exhaust
no cat - straight pipe
Stock muffler
NO CODES, runs fine and idles nice. But has a slight miss off idle

I am getting around 12mpg!
Duno what I am getting now, as I just installed a cat because I did not like the raw fuel smell and the excess noise...
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Report this Post06-15-2010 04:08 PM Click Here to See the Profile for CooterSend a Private Message to CooterDirect Link to This Post
My 1985 SE with a TBI Caddy 4.5/ 4t60 gets 22~24 MPG in town and a little over 30 on the highway.
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FieroMonkey
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Report this Post06-15-2010 05:54 PM Click Here to See the Profile for FieroMonkeyClick Here to Email FieroMonkeySend a Private Message to FieroMonkeyDirect Link to This Post
 
quote
Originally posted by ALJR:

Interesting this just came up; as I was wondering waht the heck is wrong with my MPG!

First, I have an 88GT manual
Brand new rebuild, everything new (still under 500 miles)
Stroked to 3.1L
272 cam
FPR set to 45psi
Total seal rings
Port/polish intake/exhaust
no cat - straight pipe
Stock muffler
NO CODES, runs fine and idles nice. But has a slight miss off idle

I am getting around 12mpg!
Duno what I am getting now, as I just installed a cat because I did not like the raw fuel smell and the excess noise...


Be prepared to replace the CAT again soon if you are getting 12 mpg and have raw gas smell out the pipes...
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30+mpg
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Report this Post06-15-2010 06:00 PM Click Here to See the Profile for 30+mpgClick Here to Email 30+mpgSend a Private Message to 30+mpgDirect Link to This Post
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ALJR
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Report this Post06-16-2010 11:12 AM Click Here to See the Profile for ALJRClick Here to Email ALJRSend a Private Message to ALJRDirect Link to This Post
 
quote
Originally posted by FieroMonkey:


Be prepared to replace the CAT again soon if you are getting 12 mpg and have raw gas smell out the pipes...


Raw gas smell was before the cat was installed. I do not smell it now...
Should I be worried still? What would cause it?

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Formula Owner
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Report this Post06-17-2010 08:45 AM Click Here to See the Profile for Formula OwnerSend a Private Message to Formula OwnerDirect Link to This Post
 
quote
Originally posted by ALJR:


Raw gas smell was before the cat was installed. I do not smell it now...
Should I be worried still? What would cause it?


I would still be concerned about it. You haven't fixed the problem. You've just masked it. A fuel smell that was "fixed" with a new cat would be a result of running too rich, which could be caused by an exhaust leak upstream of the O2 sensor (cracked manifold(s) or blown manifold gasket), a bad sensor, and probably a few other things I haven't thought of.
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Report this Post06-17-2010 09:04 AM Click Here to See the Profile for starlightcoupeSend a Private Message to starlightcoupeDirect Link to This Post
26-28 mpg with 3800SC and 4t65e HD. My lead foot has something to so with not getting better mileage.
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Report this Post06-17-2010 10:47 AM Click Here to See the Profile for ALJRClick Here to Email ALJRSend a Private Message to ALJRDirect Link to This Post
 
quote
Originally posted by Formula Owner:


I would still be concerned about it. You haven't fixed the problem. You've just masked it. A fuel smell that was "fixed" with a new cat would be a result of running too rich, which could be caused by an exhaust leak upstream of the O2 sensor (cracked manifold(s) or blown manifold gasket), a bad sensor, and probably a few other things I haven't thought of.


No crackes anywhere. Manifolds were ported then welded. Very quiet in the engine bay (aside from the roller-rocker sewing machine noise)...
I would have to imagine if I had a bad sensor, I would see a code of some sort?

Thinking I should start a new topic in the tech section for this...
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Report this Post06-17-2010 12:55 PM Click Here to See the Profile for Rick 88Send a Private Message to Rick 88Direct Link to This Post
88 GT 5-speed, bone stock except for K&N filter. Using the A/C all the time (west Texas) and a combo of in town and freeway driving I average 27-28 mpg.

[This message has been edited by Rick 88 (edited 06-17-2010).]

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Report this Post06-17-2010 01:55 PM Click Here to See the Profile for jgrotzinClick Here to Email jgrotzinSend a Private Message to jgrotzinDirect Link to This Post
AJLR- dunno if this is the issue but if you are using different injectors with higher fuel pressure it could cause the rich condition you seem to be experiencing.

I think factory is like 42, and if you are using the multec style injectors vs the pintile style, I have seen them go rich at idle, and added fuel pressure might just exacerbate the situation.
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Report this Post06-17-2010 07:20 PM Click Here to See the Profile for FieroseverywhereClick Here to Email FieroseverywhereSend a Private Message to FieroseverywhereDirect Link to This Post
18-22 city, 27-29 HWY @ 70mph. 4.9/getrag with 25.7" diameter rear tires. Still have an issue with the MAT tables in the PCM. Hoping to get a little more once thats fixed.
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Report this Post06-17-2010 08:10 PM Click Here to See the Profile for FFIEROFREDClick Here to Email FFIEROFREDSend a Private Message to FFIEROFREDDirect Link to This Post
14 city/24 highway with a 84 fiero / used up old 1983 crossfire 305/ 4t60 ( 2.84 rear). car with out driver is 2988 pounds on the scca 4 cornner scales.
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Report this Post06-18-2010 10:06 AM Click Here to See the Profile for ALJRClick Here to Email ALJRSend a Private Message to ALJRDirect Link to This Post
 
quote
Originally posted by jgrotzin:

AJLR- dunno if this is the issue but if you are using different injectors with higher fuel pressure it could cause the rich condition you seem to be experiencing.

I think factory is like 42, and if you are using the multec style injectors vs the pintile style, I have seen them go rich at idle, and added fuel pressure might just exacerbate the situation.


Thanks for the info!
I am running the stock 2.8 injectors, that is why I bumped the PSI up a bit (for the 3.1 displacement)...

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Report this Post06-18-2010 10:22 AM Click Here to See the Profile for infinitewillSend a Private Message to infinitewillDirect Link to This Post
I have been tracking my 87 GT Auto mileage since last Dec. The best I had ever achieved was 21.4 of highway driving. I had noticed a progressively worse vibration at the rear of the car at 60+ mph and had assumed it was due to a failing motor mount. The P.O. of this car had replace the two rear tires with Goodyear Eagle GT's a few years ago and they were quite weather checked and mismatched to the fronts. So I decided t replace a four with Bridgestone Potenzas until I upgrade my wheels and tires to 18" sizes. Having driven 1000+ miles since the new tires my mileage jumped to 24.5 and the last 2 days I completed a 600 mile trip at 75 mph highway driving and averaged 25.6 on the last tank or fuel. I am amazed that tire choice made that big of a difference not to mention how much quieter the ride is. On the negative side I now realize how bad my exhaust system is and it will need to be replaced very soon.
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Report this Post06-18-2010 01:30 PM Click Here to See the Profile for Vernon8360Send a Private Message to Vernon8360Direct Link to This Post
29/30 mpg on the highway, steady 70/75 mph, stock set up.

------------------
1988 GT
Manual
Medium Red Metallic
Gray Leather

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17Car
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Report this Post06-18-2010 10:46 PM Click Here to See the Profile for 17CarSend a Private Message to 17CarDirect Link to This Post
0 Mi/Gal, my fiero currently has no engine
Anyone know average milage for a Northstar/5speed combo?
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