Better than average fuel economy? Isn't my Fleetwood actually hanging onto the lead for best mileage? Hehe

 

The fleetwood LT1 probably gets better mileage than the F-Body LT1 due to the compression ratio difference. But the heavier chassis should definitely cause more gas consumption...

 

16-17 mpg here, that was before the cam install. Havent had it long enough to know what it is now.... i hope good

 

Uhm... I think 10.5-1 Compression... Least MSN autos says that on my Fleetwood's LT1... I dont have my owner's manual available, the car is still parked safely at UCF because of Hurricane Frances.

 

yes i am. try it if you dont believe me. I have noticed it the most with my firebird, the least with my vr4 but thats because only one window worked It does make a difference.

 

Yeah you got me there. Your fleetwood is about as aerodynamic as my work boot and with the same engine you still get better gas mileage. Your rear has a little bit taller gears and unless you have a different transmission then i would say i am wrong and aerodynamics don't make a difference.

 

14 - 17 MPH depending on weather conditions.

1997 T/A, auto, 3.23, intake, MAF, plugs, wires, headers, y-pipe, cat-back, HPP 3.

~80k miles.

 

16-18 all city/racing all night long and 20-22 with city/highway mix. Mods/times in sig.

 

I average 24 MPG in my Z28

 

yes, I average about 22-24mpg highway, 19-21 city. I have a 97 formula 2.73s A4 with slp CAI, Granatelli maf, hyptertech 160 stat with a hypertech programmer. Once the 4.10s go in, i'm expecting a 2-3mpg drop.

 

18-20 city, up to 24 highway.

intake, exhaust, reprogrammed computer, 3.23 M6 convertion

gonna miss that 24 highway when I get the 4.10s

But i gained about 3mpg overall with the intake/exhaust

 

I think someone said one time gas mileage in an LT-1 is inversly proportional to how much fun you have.

The AC is better myth only applies to the highway. It's pure physics, without thinking too hard I remember the airflow is proportional to velocity squared(someone who has a few more braincells than I right now back me up). Just stick your hand out of the window at 25MPH not much but at 50MPH it should have about ~4 times the effect at 75 ~9 times the effect(see where im going MR. 100 on the highway).

BTW They really hate when you do it but tailgate semi's on the highway because of the aforementioned reason of airflow. You must get really close for this to work. You can seriously increase fuel ecomnomy by about 30-40% at least(havent been able to do it for an entire tank of gas but it really works).

94 Formula(bolt on)15-17-city/ 26.5 only time I was on the highway enough to eat an entire tank of gas.

I'll let you know the numbers after my heads and cam whenever my knock sensor decides to quit fussing.

Rich

 

i just filled up for the first time after the cam... 14.5 but that was after about 200 miles of new-cam-testing

 

I'm getting horrible gas mileage, but my car is running SUPER rich. I'm thinking I might have a leaky injector.

12-13mpg city, 15-17mpg highway. I wish it was fast enough to back up that shitty gas mileage

 

11-17 city 24-30 high way.. Mods in sig

 

Stock M6 with 3.42's. My first freeway trip the A/C was blasting, and traffic was heavy so I was always having fun in the passing lane. Still got a solid 28 on the trip. I am in the process of dropping in 3.73's. Hope that won't change this cheap ride.

 

sorry wrong thread

 

Hey, you have any plans for those 3.42's? And is the rear end the same on the 96 Fleetwood as it was on the Camaro? Ie, would I be able to toss those 3.42's into my car? (The Fleetwood had 3.42's as an option of the tow package.)

 

94 bird, LT1 a4 with 2:73,s/daily driver (great for all the freeway driving i do).. though ive never bothered calculating my MPG, they r extremely poor. i was told to reprogram when i installed my 160 stat or else id get poor mileage, well its the truth i live in the a busy californian city, stop lights every block and WOT is called for when passing = fill up every 2-3 days

only mods:
K&N intake
hypertech ignition
3" flowmaster cat-back
set of BFG G-force 16"ers

love my car

 

That's pretty good but my wifes 94 Imp SS got about 19/21 in the city and 32 on the highway with all the bolt-ons and 3.08 rear. Then we dropped in the hotcam and a set of heads...BAM!!!! 14-15 city / 22-26 hwy. 2 tons of fury....and a baby seat in the back.