Miles per Gallon
06-06-2006, 12:00 PM
#51
Senior Member
Join Date: Jul 2004
Location: Victorville, CA
Posts: 742
Likes: 0
Received 0 Likes
on
0 Posts
Car: 85 Trans Am
Engine: 350 (CCC QJet)
Transmission: 700R4
Axle/Gears: 3.08 9 bolt
13 city/21 hwy, and thats not beating it 
Cant seem to get the carb right on the damn thing. One day works great, next it sucks. oh well.
Cant seem to get the carb right on the damn thing. One day works great, next it sucks. oh well.
08-25-2006, 11:41 AM
#52
Member
Join Date: May 2000
Location: Parkersburg, IA, U.S.
Posts: 419
Likes: 0
Received 0 Likes
on
0 Posts
Car: Trans Am
Engine: L69
Transmission: T5
Axle/Gears: 3.73
Well I just drove my 84 TA on a 67 mile trip I used 2.3 gallons of gas that is 29.1 mpg..... That seems to be too high, but a I filled it up exactly each time squeazing in up to the neck.. Its an L69 305, T5 3.73 rearend... I babied it and drove 55 to 60 mph the whole way. It has 40,300 miles on it with a new cap rotor plugs and wires slp headers and y pipe flowmaster catback.. oh well I am happy with it even though its not that fast is sounds good and it fun to drive..
08-25-2006, 01:19 PM
#53
Supreme Member
Join Date: Aug 2001
Location: Caldwell,ID
Posts: 5,389
Likes: 0
Received 2 Likes
on
2 Posts
Car: 2005 BMW 545i
Engine: 4.4L N62B44
Transmission: 6spd auto
Axle/Gears: Rotating
Sounds like you're getting pretty good mileage to me. I had a hard time getting mileage that good with my L98 GTA. Just about never, actually.
I have a hard time believing anyone is getting 28mpg, at least with a 3rd gen. I could get that out of my LS1 Formula on the highway, but that was with a M6. In 6th gear, it barely turned 2000rpm at 80mph. During everyday driving, I got about what you're getting now.
I have a hard time believing anyone is getting 28mpg, at least with a 3rd gen. I could get that out of my LS1 Formula on the highway, but that was with a M6. In 6th gear, it barely turned 2000rpm at 80mph. During everyday driving, I got about what you're getting now.
there are a few that might be able but most of them are 4 cylinders or 6 cylinder motors
though I think a few reputable members have gotten close to that with some good tuning in the ECU to lean out the mixture a tad at hwy cruise speeds
08-25-2006, 06:31 PM
#54
Senior Member
Join Date: Aug 2005
Location: Beautiful Tunnel Hill Georgia
Posts: 615
Likes: 0
Received 0 Likes
on
0 Posts
Car: 67 Firebird Convertible
Engine: LB9
Transmission: 700R4
Axle/Gears: 3.55
16 town/24.5 highway @ 75-80
305 TPI/700R4/3.23 rear in 40 Chevy coupe.
Engine is pretty much stock w/1.6 rockers and I've been tuning it a little.
305 TPI/700R4/3.23 rear in 40 Chevy coupe.
Engine is pretty much stock w/1.6 rockers and I've been tuning it a little.
08-25-2006, 10:03 PM
#55
Junior Member
Join Date: Jul 2006
Posts: 97
Likes: 0
Received 0 Likes
on
0 Posts
I have a 305 with tbi its a 700r4 with 2.73 gears . i am going on a 8 hour round trip next week on the high way. i will check it then . but if it doesnt get at least 30 i will be very suprised. it does like 1700 rpm at 70 mph.
03-08-2007, 10:15 PM
#57
Member
iTrader: (1)
Join Date: Jun 2004
Location: Southern CA
Posts: 282
Likes: 0
Received 1 Like
on
1 Post
Car: 1984 Firebird Trans Am
Transmission: 700R4
Axle/Gears: 3.73 Posi
19 and 22mpg??? WTF? I get only 14mpg street OR highway (1984 Trans Am stock L69, auto 700R4, 3.73:1 gears, stock everything except flowmaster exhaust.) My torque converter isnt locking, but still, my mileage is way too low
(1984 Trans Am stock L69, auto 700R4, 3.73:1 gears, stock everything except flowmaster exhaust.) My torque converter isnt locking, but still, my mileage is way too low
04-18-2007, 12:43 AM
#58
Re: Miles per Gallon
Well, after messing with my timing a bit, installing a new ignition, plugs, plug wires, re-setting my cruise (84's have the dumbest cruise set up I've ever seen), and changing most of my vacuum lines, I'm finally nailing 22mpg on the highway at 65 and 18 around town. Oh yeah, AND I fixed a leaky fuel pump. I probably lost a gallon over a tank from that thing.
----------
Yes, you definitely have a problem. Those are the kind of MPG numbers I'd expect to see out of a stroker....
----------
Yes, you definitely have a problem. Those are the kind of MPG numbers I'd expect to see out of a stroker....
Last edited by Ozz1967; 04-18-2007 at 12:45 AM. Reason: Automerged Doublepost
04-18-2007, 02:40 AM
#60
Supreme Member
Join Date: May 2006
Location: Maui, Hawaii
Posts: 1,857
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1984 Trans Am
Engine: broken 385sbc
Transmission: G-Force rebuilt T-5
Axle/Gears: Currie 9" Ford 4.30:1
Re: Miles per Gallon
gas mileage=not enough.. around 7-8 mpg.. but i dont care.. its a fun 7-8 mpg..
04-18-2007, 10:39 AM
#61
Re: Miles per Gallon
I expect the day that I finally drop in my 355 that my gas mileage will take a dump. 
Right now, I drive it every day because well...I get better MPG than my truck does....and it's a 2006! haha That and it's a lot more fun to drive.
Right now, I drive it every day because well...I get better MPG than my truck does.
...and it's a 2006! haha That and it's a lot more fun to drive. 
04-18-2007, 01:34 PM
#63
Junior Member
Join Date: Jul 2006
Location: Irvine, CA
Posts: 11
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1991 Camaro RS
Engine: L03 305 TBI needs to go
Re: Miles per Gallon
I get 10.5 mpg if I'm lucky. I got 11.75 mpg, but it wasn't very fun that tank. And I have a stock L03. It's bad.
04-18-2007, 07:29 PM
#64
Senior Member
iTrader: (4)
Join Date: Feb 2005
Location: Portage, MI.
Posts: 593
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1986 Z-28
Engine: 350
Transmission: 700R4
Re: Miles per Gallon
I've got a 91 305 in my 86 Z-28 with 600 edelbrock and performer, 700r4, 2:73 rear. I'm averaging 15-16+ in the city. Haven't had it on a highway in a long time. Gas was almost $3.00 and I was thinking about selling but gas came back down a bit $2.69. And it something breaks I can fix it without using a computer.
Thread
Thread Starter
Forum
Replies
Last Post
IROCZDAVE (88-L98)
Engine/Drivetrain/Suspension Parts for Sale
1
11-19-2015 07:03 AM
dbrochard
Engine/Drivetrain/Suspension Parts for Sale
13
10-03-2015 12:43 PM
