I just ran outta gas in my driveway trying to figure this out...
I got 200 miles to a tank(lt1)... I get on it at least twice a day, and I do mixed driving(highway/streets).. And I have 373's, 2500 stall, gm846 cam which do NOT help when I cruise at 80mph.... I don't try and get good mileage needless to say.

 

Again, we are in an LS1 forum.. but .. on my LT1.. the best I would get with 3.73's and stall, 240 miles.. I ran out of gas so often (more than 5 times in 3 years) that I carried a gas can in the trunk and a skateboard to get to the gas station.

 

Ok this is making me sick hearing about the gas mileage you all are getting. This is my friends name and i have a 02' Z28 with LT's, Loudmouth Exhaust, Thermostat and Lid. I fill up right when it gets to below a quarter of a tank left and i only have about 180 miles on the trip odometer. My 02 sensor has been flipping out. What is the deal with this? Help please i need better gas mileage.

 

On a highway trip I got 410 to a tank once coming back from florida, when In first bought the car.
Average" when stock" was 320-385 depending on how I drove it.
Cammed its about 250-330. Depending on how I drive it.

 

Best I've got was 360. 8o mph cruise, no getting on it, But I didnt buy my Z28 with mileage in mind

 

Any help on why my car doesnt get good gas mileage??? Look at my above post.

 

Well...get your 02 sensor should be fixed/replaced first then see where it is. That could be your whole problem.

 

I was going to say 15.5 like said above. To lazy to go out in the cold to find out.

 

Where the hell are you guys gettin 30mpg? I average 20MPG, mixed driving. Damn you six speed guys.......

 

2001 Camaro SS... I swear I calculated 36-38MPG pure highway a year ago going from NC to Georgia... using 6th gear the entire time +cruise control Avg 70-90 mph (possibly more at times)

The same trip I got 32mpg in a 2004 Pontiac Vibe (5 speed, downshifting to get up hills )

But I want to say i must have miscalculated on the camaro, because hardly anyone of you guys are hitting even 30 mpg... but if a 5speed did 32.. then a 6speed makes sense doing higher ... It was so long ago though I can't remember.. I guess the hills may have helped a LOT too... all the hills help you to accelerate like crazy, and you're going so fast at the bottom of the hill that going up the next one is easy as pie..

I dunno.. Maybe i'm insane.. I swear my math wasn't wrong, though.. I don't remember though...

 

No way.

 

Well, as much as I can't understand how some guys get such exceptionally high mileage out of their F-bodies, I can't argue 'cause I've got 3 buddies with LT1 F-bodies, and all of them get much better mileage than I do. The highest is a '97 Z28 M6, and he claims that he's gotten as high as ~460 or maybe even ~490 on a long highway cruise, in 6th gear, doing no more than ~70 mph!? I'm pretty sure he says that ~350 - 400 miles / tank is pretty much normal, until he starts driving more "spirited".

Like I say, that blows me away, 'cause the highest I EVER got was only 310, but even my other friend's '96 T/A, A4, 2.73's has pulled well over 300 miles / tank?

 

When i went to pick up my 1999 Trans Am, auto with 2.73's and 32k. It was a three hour drive, 225 miles and I used amlost half a tank...I got better mileage than my dads 00 Grand Prix. I was driving on I95, then the NJ Turnpike, then the Parkway, so it was all highway.

 

Other day i filled up at half a tank and had over 200 It was all highway with cruise set at 75. i figured it up buy gallons put in and mileage and got 26.7 MPG!

 

My Auto LT1 sucked gas like there was no tomarrow...I never saw better then 270 a tank and it had 2:73's.