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Actual, real-life fuel economy for 2.8 V6 by seq
Started on: 06-26-2014 05:38 PM
Replies: 23 (1712 views)
Last post by: fieroguru on 06-28-2014 07:40 AM
seq
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Report this Post06-26-2014 05:38 PM Click Here to See the Profile for seqClick Here to Email seqSend a Private Message to seqEdit/Delete MessageReply w/QuoteDirect Link to This Post
When I was in in Webster/Rochester area, I had a chat with Fierobug about fuel economy/mileage. I wasn't able to do the unit conversion on the spot, since I use L/100km -- also, our old system used a proper gallon, instead of a US gallon

That said, I've had some time to do the conversions, and wanted to reach out to see what other people are getting in the real world, as opposed to "theoretically", or "once downhill with the wind at my back". I track every tank with Fuelio on my phone.

My overall average is 9.14 l/100km -- 25.7 miles per US gallon. This covers 17 fill-ups between April 08 (my first fill-up) to June 19 (my most recent fill-up), spanning 5627 km (3496.5 miles). (I've done a couple of trips, and tend to fill up before/after, even if I'm not empty).

This is trending down (or up, for your US units), though. My early fill-ups were in the 10-12 range (23.5-19.5), while my most recent have been in the 8.1-8.5 range (29-27.5). I think some combination of winter gas and new-to-me driving is to blame

As an aside, the topic of engine speed was brought up, as my 5-speed may have different results than an automatic. On my drive home, the max speed I hit was roughly 110km/h, or 70mph. Engine around 2300-2400 RPM (presuming the tach is accurate).

Is this in-line with what everybody else is actually getting in the real world?

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steve308
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Report this Post06-26-2014 05:49 PM Click Here to See the Profile for steve308Send a Private Message to steve308Edit/Delete MessageReply w/QuoteDirect Link to This Post
86 2.8 auto --- around town 19 - 21 ----- highway trip back from Carlisle (150 miles each way speeds 55- 80) about 25. Running with a friend who has a 3800 sc (5 speed I think) He got 35+. Need to repower soon I guess.
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olejoedad
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Report this Post06-26-2014 06:00 PM Click Here to See the Profile for olejoedadClick Here to Email olejoedadSend a Private Message to olejoedadEdit/Delete MessageReply w/QuoteDirect Link to This Post
Your mileage is typical.
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Gall757
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Report this Post06-26-2014 06:56 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
With my 2.8 5 speed there is a wide range of mileage depending on driving conditions....so naturally the % of city/highway will make a big difference. The best I have seen is 32....5th gear cruise control for the whole tank. City driving..(spirited city driving, some might say) gets a mileage of 19!!

It's fun, though....
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Bloozberry
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Report this Post06-26-2014 07:02 PM Click Here to See the Profile for BloozberrySend a Private Message to BloozberryEdit/Delete MessageReply w/QuoteDirect Link to This Post
With an '86 2.8L GT with an Isuzu 5 speed, I measured my average mileage over 4600 kms on a freshly rebuilt engine and got the following:

Highway: 8.72 L/100 kms (or 32.57 MPG(imperial))
City: 9.86 L / 100 kms (or 28.6 MPG(imperial))
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joeschuit
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Report this Post06-26-2014 08:03 PM Click Here to See the Profile for joeschuitClick Here to Email joeschuitSend a Private Message to joeschuitEdit/Delete MessageReply w/QuoteDirect Link to This Post
I've got an 86gt with the 4 speed. City driving with short drives(5 minutes) gets me 18-19mpg. Highway only I've gotten 26-27mpg, going 65-70mph.
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josef644
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Report this Post06-26-2014 08:27 PM Click Here to See the Profile for josef644Click Here to Email josef644Send a Private Message to josef644Edit/Delete MessageReply w/QuoteDirect Link to This Post
3.4 dressed out as a 2.8. I get around 25-26 on the highway, bout 23 city driving.
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Old Lar
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Report this Post06-26-2014 08:44 PM Click Here to See the Profile for Old LarSend a Private Message to Old LarEdit/Delete MessageReply w/QuoteDirect Link to This Post
My 87 GT five speed so far for 2014:

date........$/gal.............$$.......mileage. brand..mpg
6/3/2014 3.639 6.184 $22.50 148,203 BP Y 29.64
6/2/2014 3.439 7.067 $24.30 148,011 Shell Y 31.05
6/2/2014 3.389 5.932 $20.10 147,786 Raceway Y 31.84
6/2/2014 3.599 7.086 $25.50 147,595 Raceway Y 32.20
6/1/2014 3.799 7.027 $26.70 147,386 Casey's Y 29.49
6/1/2014 3.699 6.218 $23.00 147,183 BP Y 28.89
5/30/2014 3.679 3.983 $14.65 147,007 BP Y 28.30
5/29/2014 3.619 5.665 $20.50 146,902 BP Y 26.36
5/29/2014 3.849 7.534 $29.00 146,700 BP Y 35.66
5/28/2014 3.799 6.844 $26.00 146,470 Phillips 66 Y 30.53
5/27/2014 3.439 6.950 $23.90 146,266 Shell Y 29.81
5/27/2014 3.699 6.380 $23.60 146,037 BP Y 32.95
5/27/2014 3.399 7.415 $25.20 145,839 Pilot Y 31.03
5/26/2014 3.529 5.639 $19.90 145,626 BP Y 28.73
5/26/2014 3.639 4.393 $15.99 145,444 Valero Y 32.28

This was mostly all highway driving from Florida to Wisconsin and back.


For 2011 28.7 mpg average.
For 2012 30.6 mpg average
For 2013 29.8 mpg average
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mrfred8
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Report this Post06-26-2014 08:46 PM Click Here to See the Profile for mrfred8Click Here to visit mrfred8's HomePageSend a Private Message to mrfred8Edit/Delete MessageReply w/QuoteDirect Link to This Post
my 88GT with 2.8 and 3spd auto does around 24 highway, 19 city
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zzzhuh
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Report this Post06-26-2014 09:59 PM Click Here to See the Profile for zzzhuhSend a Private Message to zzzhuhEdit/Delete MessageReply w/QuoteDirect Link to This Post
My 86 gt 4 speed muncie is getting very strange fuel economy. Not that im complaining but somehow I am able to get 28-32 mpg which I thought was very odd for the 4 speed. This mileage includes highway (coasting at 65?) and sometimes dropping the clutch at stop signs. I am using premium 91 along with an injection cleaner ever 3-5 thousand miles.

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The wetter the better

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1Packrat
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Report this Post06-26-2014 11:35 PM Click Here to See the Profile for 1PackratSend a Private Message to 1PackratEdit/Delete MessageReply w/QuoteDirect Link to This Post
86GT auto 27.5 – 31 MPG
I picked up 3+ MPG when a new Delco coil was installed. The coil breaks down so gradually that you don’t notice until it is replaced. Then it was like wow where was this power hiding. On the first startup after adding the new coil the idle RPM was 400 higher until the ECM dropped it back to normal. Only problem I have now is with that extra kick I have a major problem with my right foot. It just feels soooo… good.
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Patrick
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Report this Post06-27-2014 01:30 AM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by seq:

This is trending down (or up, for your US units), though. My early fill-ups were in the 10-12 range (23.5-19.5), while my most recent have been in the 8.1-8.5 range (29-27.5). I think some combination of winter gas and new-to-me driving is to blame


It stands to reason that your mileage is better now than it was during the winter. Cold engines use a lot of gas.
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Csjag
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Report this Post06-27-2014 10:37 AM Click Here to See the Profile for CsjagClick Here to Email CsjagSend a Private Message to CsjagEdit/Delete MessageReply w/QuoteDirect Link to This Post
Haven't checked my 2.8 GT yet but on a recent highway trip at 65 with some bursts to 70 I got 34 mpg on my 85 2M4 that has 118,000 miles on it.
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Gall757
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Report this Post06-27-2014 11:34 AM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Old Lar:

My 87 GT five speed so far for 2014:

date........$/gal.............$$.......mileage. brand..mpg
6/3/2014 3.639 6.184 $22.50 148,203 BP Y 29.64
6/2/2014 3.439 7.067 $24.30 148,011 Shell Y 31.05
6/2/2014 3.389 5.932 $20.10 147,786 Raceway Y 31.84
6/2/2014 3.599 7.086 $25.50 147,595 Raceway Y 32.20
6/1/2014 3.799 7.027 $26.70 147,386 Casey's Y 29.49
6/1/2014 3.699 6.218 $23.00 147,183 BP Y 28.89
5/30/2014 3.679 3.983 $14.65 147,007 BP Y 28.30
5/29/2014 3.619 5.665 $20.50 146,902 BP Y 26.36
5/29/2014 3.849 7.534 $29.00 146,700 BP Y 35.66
5/28/2014 3.799 6.844 $26.00 146,470 Phillips 66 Y 30.53
5/27/2014 3.439 6.950 $23.90 146,266 Shell Y 29.81
5/27/2014 3.699 6.380 $23.60 146,037 BP Y 32.95
5/27/2014 3.399 7.415 $25.20 145,839 Pilot Y 31.03
5/26/2014 3.529 5.639 $19.90 145,626 BP Y 28.73
5/26/2014 3.639 4.393 $15.99 145,444 Valero Y 32.28

This was mostly all highway driving from Florida to Wisconsin and back.


For 2011 28.7 mpg average.
For 2012 30.6 mpg average
For 2013 29.8 mpg average


Gotta love that tail-wind on the morning of May 29! Or is there some other explanation?

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GodSend
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Report this Post06-27-2014 11:59 AM Click Here to See the Profile for GodSendClick Here to Email GodSendSend a Private Message to GodSendEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by steve308:

86 2.8 auto --- around town 19 - 21 ----- highway trip back from Carlisle (150 miles each way speeds 55- 80) about 25. Running with a friend who has a 3800 sc (5 speed I think) He got 35+. Need to repower soon I guess.


Do the 3800 sc's really get that good milage? May have to consider the swap just for economy alone
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stickboy
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Report this Post06-27-2014 12:32 PM Click Here to See the Profile for stickboySend a Private Message to stickboyEdit/Delete MessageReply w/QuoteDirect Link to This Post
My driving is about 75% highway/25% city. Over 30,000 miles and 3 years I'm see about 27MPG. It goes down a little in the winter. I also saw a 1-2MPG increase after my coil failed and was replaced with a new one.

------------------
Black '88 Fiero Formula, 5spd Getrag, Pretty much stock, but big plans for it!!

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2.5
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Report this Post06-27-2014 02:00 PM Click Here to See the Profile for 2.5Send a Private Message to 2.5Edit/Delete MessageReply w/QuoteDirect Link to This Post
Highway 30mpg, 88 Formula 5 speed.
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2.5
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Report this Post06-27-2014 02:02 PM Click Here to See the Profile for 2.5Send a Private Message to 2.5Edit/Delete MessageReply w/QuoteDirect Link to This Post

2.5

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Member since May 2007
Also take into account if you are using real gas or 10% ethanol, and what octane.
Mine was 87 octane 10% ethanol becuause its hard to find real gas up here and it costs 30-40 cents more per gallon when you do.
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Report this Post06-27-2014 02:04 PM Click Here to See the Profile for CsjagClick Here to Email CsjagSend a Private Message to CsjagEdit/Delete MessageReply w/QuoteDirect Link to This Post
Since my 85 GT has over a 100k on it do you think it would be a good idea to replace the original coil as a matter of maintenance and if so should I go with a stock one or an MSD coupled with new wires? Thanks
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Report this Post06-27-2014 03:15 PM Click Here to See the Profile for dobeySend a Private Message to dobeyEdit/Delete MessageReply w/QuoteDirect Link to This Post
My 87 GT 5 speed would get 28 MPG all highway at 70-80 MPH before the head gasket blew on it. Would get around 19-20 MPG around town.
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2.5
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Report this Post06-27-2014 04:57 PM Click Here to See the Profile for 2.5Send a Private Message to 2.5Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Csjag:

Since my 85 GT has over a 100k on it do you think it would be a good idea to replace the original coil as a matter of maintenance and if so should I go with a stock one or an MSD coupled with new wires? Thanks


Id say it would be a good idea to get one and keep in in the trunk, or you could replace it and keep your old on in the trunk.
I have used the MSD, but I dont know if they are actuall more powerful or not.
Yep wires and plugs too as general maintinence.
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Kevin87FieroGT
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Report this Post06-27-2014 09:37 PM Click Here to See the Profile for Kevin87FieroGTSend a Private Message to Kevin87FieroGTEdit/Delete MessageReply w/QuoteDirect Link to This Post
Try a MSD Streetfire coil with FS STI 7.5mm wires. They work great as a stock replacements. Three years with them here, no problems, runs great. Getting 32-33mpg highway, 70mph, 2.8, getrag, cruise on.

Just guessing about 24mpg with overall spirited driving, everyday cruising, highway mix. Regular gas (10% ethanol), mild weather driving.

[This message has been edited by Kevin87FieroGT (edited 06-27-2014).]

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HarryT
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Report this Post06-28-2014 01:06 AM Click Here to See the Profile for HarryTClick Here to Email HarryTSend a Private Message to HarryTEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have been plotting my 87 GT 2.8 with 5 speed since 2007. Mixed driving, mostly SC, NC, GA and Tenn. mountain roads.
35 tanks Average 24.80 MPG
Harry (Age 75)

[This message has been edited by HarryT (edited 06-28-2014).]

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fieroguru
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Report this Post06-28-2014 07:40 AM Click Here to See the Profile for fieroguruSend a Private Message to fieroguruEdit/Delete MessageReply w/QuoteDirect Link to This Post
My old 2.8/Isuzu would get 24-26 mpg on my daily commute (19 miles each way, mostly curvy 2 lanes with about 10 stops) and 32-33 mpg on the interstate.
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