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Poor fuel mileage , V6 4 Speed. by PontiacJoe1995
Started on: 04-20-2014 01:55 PM
Replies: 7 (164 views)
Last post by: gwg1995 on 04-22-2014 08:53 PM
PontiacJoe1995
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From: Jim Thorpe PA , S.I NYC.
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Report this Post04-20-2014 01:55 PM Click Here to See the Profile for PontiacJoe1995Click Here to Email PontiacJoe1995Send a Private Message to PontiacJoe1995Edit/Delete MessageReply w/QuoteDirect Link to This Post
Hey guys , been driving my '85 GT frequently now since the weather is more pleasant. I live in the NYC Metro area , so I'm assuming this plays a very large factor with economy. However , I'm getting a pretty mediocre rating of 13 1/2 miles to the gallon.
Car is a 4 speed manual , fresh tune-up stuff , tire pressure 32 all round , Alignment is good , not driven hard etc
The car on the highway is good , usually 200 - 215 miles until I have to fuel up.

However this is my calculation off of the fuel gauge , It's reading half a tank ( 1985 is 10.5 gallon tank ) and I only went around 44 miles using 87 Octane ( Regular ).
I know the proper way to calculate MPG without the gauge , but just never got a chance in doing so.

Just want to know your guys input , I should check the plugs one of these days when I get free-time , just to see what the gap is at.

Thanks.
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Gall757
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Report this Post04-20-2014 02:10 PM Click Here to See the Profile for Gall757Send a Private Message to Gall757Edit/Delete MessageReply w/QuoteDirect Link to This Post
The fuel gauge is telling you nothing useful. When you get a chance to fill the car, drive it over 100 miles and fill it again, then you can calculate the mileage.

Most Fiero fuel gauges are wrong, and the right ones have probably been rebuilt.

[This message has been edited by Gall757 (edited 04-20-2014).]

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Csjag
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Report this Post04-20-2014 06:27 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
I would guess your probably getting 20 to 22 mpg driving around town, let us know what it works out to
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weaselbeak
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Report this Post04-21-2014 09:21 AM Click Here to See the Profile for weaselbeakClick Here to Email weaselbeakSend a Private Message to weaselbeakEdit/Delete MessageReply w/QuoteDirect Link to This Post
I have the n/a 3800 with 4 speed, I get 25-26 on the open road, maybe 20-22 otherwise. No overdrive to help it out.
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gwg1995
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Report this Post04-21-2014 09:48 AM Click Here to See the Profile for gwg1995Click Here to Email gwg1995Send a Private Message to gwg1995Edit/Delete MessageReply w/QuoteDirect Link to This Post
I have an 86 GT and the most gas my car has ever let me put in it (on empty) is about 8 gallons. It makes me feel like I'm getting horrible gas mileage because I'm constantly filling up. I'm actually getting 17-18 with the 3 speed because I live in a mountainous area but I'm only getting 140-150 between fill ups.
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OziDarklighter
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Report this Post04-21-2014 10:12 PM Click Here to See the Profile for OziDarklighterClick Here to Email OziDarklighterSend a Private Message to OziDarklighterEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by gwg1995:

I have an 86 GT and the most gas my car has ever let me put in it (on empty) is about 8 gallons. It makes me feel like I'm getting horrible gas mileage because I'm constantly filling up. I'm actually getting 17-18 with the 3 speed because I live in a mountainous area but I'm only getting 140-150 between fill ups.


I'm really frustrated with my 3 speed automatic too... 4 speed would be significantly better mpg's. Perhaps worth swapping the transmission...?
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masospaghetti
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Report this Post04-22-2014 08:53 AM Click Here to See the Profile for masospaghettiClick Here to Email masospaghettiSend a Private Message to masospaghettiEdit/Delete MessageReply w/QuoteDirect Link to This Post
I was getting just under 20 mpg with my 2.8 / 4-speed combination before I swapped it. Would get about 28 on the freeway.
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gwg1995
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Report this Post04-22-2014 08:53 PM Click Here to See the Profile for gwg1995Click Here to Email gwg1995Send a Private Message to gwg1995Edit/Delete MessageReply w/QuoteDirect Link to This Post
Yeah I was on the verge of buying a 5 speed and all parts for about $500 but an 88 cradle/motor swap scarred me from taking the motor out when it is my daily driver. I'll probably just end up buying a 5 speed car when this one dies.
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