88Birdman

iTrader: (1)

I finally found a Cluster Panel with a working trip and odometer. I was wanting to know the exact mpg and was Very happy when i found out after all the time and effort i put into this car...it paid off!! So what about the rest of you v6's?

factory was

City : 17

Combined : 20

Highway : 25

Year : 1988

Model : Firebird

Engine : 2.8

Mods : CAI ( if you consider that a mod )

Currently

MPG : 20 city, 24 highway ( just updated after some adjustments )

RubberDucky

iTrader: (4)

I think last tankful I averaged 11.2. I'm too hard on my car.

But in all seriousness, I got something like 15 city and somewhere around 20 highway. I never retuned the PROM for the 3.4 swap so I run rich.

58mark

iTrader: (3)

I can get 25 if I baby it on the highway, but here in Texas, i'm going 75, so it's more like 20

Base91

iTrader: (1)

Last long run was last month to Santa Cruz and back. Mostly freeway at 70ish and I got just over 25 mpg. A big improvement over the 16-17 when I got hold of it. Daily driving around it's more like 19.

Stewie

I get 19 mpg in city driving and 25 - 27 mpg hwy. If I could keep it under 75 mpg, I'd consistently get 27, but..............

AutoRoc

iTrader: (1)

25 is my best so far all highway. 75mph, 2600rpm roughly with a loaded car + passenger. 4000lbs + rolling down the road. Top down too...

fasteddi

iTrader: (2)

About 20mpg average as of now and its about 70% highway. That's reving 2500 Rpm at 70 mph on the cars set up now.

When it was a stock car and a DD, I got arround 25. That was with a 50/50 mix of highway and town driving. Ill also add I live where there isnt a hill anywhere. Its nice and flat.

thatoneguy5x

about 12 city
23 highway

3.1 auto

my car gets thirsty in the city.

cosmick

So who was it claiming a 3.1 did 36 MPG in another thread? And why such bad numbers?
I've seen evidence of a 4.3L S-10 doing 28 MPH on the highway with a 2" drop all around, stock airdam, tonneau, 700R-4, and 3.42:1 on 26" tires, IIRC, and an old, stock '96 Bonneville 3.8 doing 35 MPG with the converter not locking. Also on several websites the details of a '78 Camaro 350 managing 25 MPG at 65 MPH, with details of how to copy it, and what went wrong. Legend has it that on one of Car Craft's old RSE events a GNX did 50 MPG.

88Birdman

iTrader: (1)

If you look at the first post it says the factory numbers if i am still close to that, then how is that bad numbers? I am quite happy with the numbers and don't care about other non 3rd gen mpg's. A 96 Bonneville... that would have the advantage of newer updated fuel efficiency system vs an 88 like mine. I'm sure some of the people who responded could get better mpg.

fasteddi

iTrader: (2)

All MPG threads always seem to get blurry with other cars...... which i dont understand why.

But im sure if you took a poll of people that were in the same situation as you with the type of surfaces your driving on, and the amount of city/highway, you would have the same numbers as your posting. But then again hopefully a few more post some feedback stats for you that are V6 thirdgen related.

Your pretty close to what the sticker would have said when the car was new and actually better in town but that comes down to how hard we are on the peddle.
I believe it was arround 17/25 for a auto and 15/24mpg for a stick for a late 2.8L f-body.

I got about that for 5 years straight when my car was completly stock and daily driven.

RubberDucky

iTrader: (4)

I wish I got that. I'm getting 12-15 city, and its mostly my fault really, I never got the PROM burned for the 3.4. With my old 2.8 I probably got 20 city.