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.

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).]

I would guess your probably getting 20 to 22 mpg driving around town, let us know what it works out to

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.

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.

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...?

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.

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.