Fairlee

Hello all,

I am having an issue with my gas mileage. I just changed my plug, wire, cap, fuel filter, etc.. Still I only get about 250 kms per tank.

I have a 91 gt 5 speed with about 120 kms. The only mods are pullies, timing @ 14, K&N filter (removed silencer).

I just bought this car last August and didn't remember it being this bad. Could the timing @ 14 cause this. Running 94 octane.

Just don't know what else to try.

Thanks,

Fairlee

ryan_89_mustang

I am getting the exact same mileage as you are. I haven't done a full tune-up yet, I am thinking it may be o2's. Have you scanned your car??

Fairlee

Haven't scaned. I guess I should.

Tune up made it run better but same gas mileage. Let me know how your tuneup goes.

Fairlee

jtmustang

what the ......how many miles is that.In my 91 gt with 170,xxx miles full boltons full exhaust,t5 3.73's in the back and 245/50's in the rear and i would get between 200-230 miles a tank which is about 15-18mpg and i didnt drive it to easy either

ryan_89_mustang

Will do I am doing a tuneup in the next 2 weeks if I can find somewhere that sells autolite coppers. If that does not fix it I will take the plunge for new o2's.

jtmustang......its 155miles

Stella94GT

[/quote]
Will do I am doing a tuneup in the next 2 weeks if I can find somewhere that sells autolite coppers. If that does not fix it I will take the plunge for new o2's.

jtmustang......its 155miles

[/quote]

****, and i though 180 was bad lol make sure you do the fuel filter and clean the maf too.

projectresto83

I usually fill up around that area. But I have a carbed setup with a 3 speed and cruise at 2g's or higher most of the time. Right about 12- 14mpg or so