Folks:

Just wondering what sort of gas mileage you are getting in the city and on the highway?

Regards,

David

25 give or take 10mpg with the supercharger.. a bit better with the turbo.

With the SC I would expect low 30's going to the track, about 15mpg at the track, and about 25 romping around town, with quite a few wide opens.

When I am done with tuning turbo setup, 36-37 mpg highway is my goal.

When I had my 87GT 3800SC, I got 29-30 mpg on the hiway with headers, smaller pulley and a Haltech Computer with average tune. 17 inch wheels.

I have a 2006 GP 3800SC series III in a 87 GT. In town any where between 14 & 17 On the hightway depending speed, But at about 70 to 75 between 29 to 31.

but what transmission are you guys running..

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My friends with a 5 sp gets ~35 on the hwy

My old car got 34mpg highway and 25 city. My new car with the old 2.8 only gets 24 highway. I miss my L67 .

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Red 86GT 4 Speed

Modded 3800SC/65E running 3.29 gears/3K stall I get 25 MPG on the highway and 23 or so in town. Before I dropped in the 42# injectors and dropped to a 3 inch pulley I was getting 31 MPG on the HWY and 27 or so in town. I tell myself to go back to stock injectors and pulley up but I can live with 25 MPG and all the power that goes along with it.

Mods should NEVER affect gas mileage, short of a extreme cam... Pulley size has no effect, and usually the upgraded injectors offer a better spray pattern than stock...My buddies that swap to 60's typically see a 2-3mpg increase overall.

The manual trans car in town will touch 38mpg average on the eway, on race gas, although it was mostly from PCM related calculations (I believe it to some degree though)

MR.drift, let me know when you want to go back to L67, we can make it happen.

quote Originally posted by darkhorizon: Mods should NEVER affect gas mileage, short of a extreme cam... Pulley size has no effect, and usually the upgraded injectors offer a better spray pattern than stock...My buddies that swap to 60's typically see a 2-3mpg increase overall. The manual trans car in town will touch 38mpg average on the eway, on race gas, although it was mostly from PCM related calculations (I believe it to some degree though) MR.drift, let me know when you want to go back to L67, we can make it happen.

I wonder about you some times!!!!!!!!!!!!!!!1

quote Originally posted by darkhorizon:MR.drift, let me know when you want to go back to L67, we can make it happen.

When one falls into my lap for super cheap. This motor runs like new, it's hard to want to take it apart when it is working so well . Though I can say that my last swap, being one of the few way back in 2002, cost WAY more than they do now. I spent 2k on mounts and exhaust alone, not to mention 2k for a motor. Seems like you can do it for way less that half that now...

quote Originally posted by Freshj: When one falls into my lap for super cheap. This motor runs like new, it's hard to want to take it apart when it is working so well . Though I can say that my last swap, being one of the few way back in 2002, cost WAY more than they do now. I spent 2k on mounts and exhaust alone, not to mention 2k for a motor. Seems like you can do it for way less that half that now...

Like, I have a swap exhaust and mounts just sitting here, I moved them out of my way today.

29-31 with the auto in mixed driving and keeping my foot out of it. I've never went through a tank full yet exclusively driving it on the hiway or in town. That's about 6 mpg better than the stock 2.8 auto that used to be in it.

well i geting 25 to 30 miles to the gallon with my 3800 fiero.

I got 25-27 on the freeway... about 14-15 pure city driving with the 4 speed muncie and 3800SC. I have a heavy foot when it comes to stop-and-go driving... no wonder my city sucks haha. I'm sure a tune would pick up a few MPGs

I'm slowly working on a 6 speed F40 swap... I hope to get over 30mpg on the freeway after that.

that cool.

[This message has been edited by jarrod (edited 03-25-2009).]

I get about 29-32 pure highway and about 25 total tank average...

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--1984 3800 Turbo / 5speed

hmm ..I get about 30mph with my 4.10 FD 3.4 DOHC IF I don't hit the gas

This hurts my heart. Something has to be wrong with my car, I just cant figure out what. I get about 14 city and 20 HW. I have a 2004 Series III SC with the getrag 5spd. Everyone gets good miles on there car I was expecting the same for mine. Got any Ideas for why this is happening?

quote Originally posted by fieroman10: This hurts my heart. Something has to be wrong with my car, I just cant figure out what. I get about 14 city and 20 HW. I have a 2004 Series III SC with the getrag 5spd. Everyone gets good miles on there car I was expecting the same for mine. Got any Ideas for why this is happening?

tune tune tune tune. My buddies car went from those numbers to 22/30 with just a half hour on the laptop.