For you V-8 bashers out there that think in hp/liters, 0-60 magazine times and magazine racing. For thouse who say that owning a V-8 is to expensive. I paid $12.5 for the car, pay about $150/month insuranance. I documented my trip from Texas to the house just because I was curious what kinda MPG you can get with 6 speed stock LS1. Im not sure where the dealership gets their figures from but here are myne. I filled up full before I left. When I got down to about 3/4 of a tank left I stoped , recorded the mileage and then toped it off and recorded how much gas I put in. I rounded off to the nearest tenth.

Total Mileage: 1524mi Stops: 6

Stop: 1
Miles Traveld: 237
Gas: 8.8
MPG: 26.9

Stop: 2
Miles Traveld: 267
Gas: 9.5
MPG: 27.6

Stop: 3
Miles Traveld: 266
Gas: 10.0
MPG: 26.6

Stop: 4
Miles Traveld: 245
Gas: 10.0
MPG: 24.5

Stop: 5
Miles Traveld: 251
Gas: 9.5
MPG: 27.0

Stop: 6
Miles Traveld: 256
Gas: 9.0
MPG: 28.4

Total:
Miles Traveld: 1524
Gas: 56.8
MPG: 26.83

Stop #4 was in a prety hilly area of TN and VA and stop #6 was further into va when the speed limit drops off to 65. I drove 80 almost all the way thru.

 

Gotta love 6th gear.

 

I get about 22-24 with the Cobra on highway trips...

Of course I also get between 12-16 in City driving

 

my 4 runner gets 26 mpg on the hwy. I don't know what the dealership says its suppose to get.

Oh and its a 4.7 liter V8

 

i get 24-25mpg highay in my fox 5.0 with 3.73 gears and 35 mpg in my stock civic, wish i had a sixth gear on my fox.

 

I get 20-25 mpg on the highway and 12-18 mpg city in my 87 vette. I guess that 4 speed with the 3 overdrive gears paid off.

 

i get 40 on the highway, bout 30 in city...blazer 4.3l vortec gets CRAPPY gas milage, around 18-22...gotta give ti to chevy on the blazer....reallllllly SUCKS

 

I consider it crappy, but then again, I drive my car to the track, dogg the shit outta it, and drive home and still get 30mpg.

Then again, your car is alot faster than mine stock

 

You have to consider I was going about 80mph all the way thru. Not many cars can run at 80mph for an extended period of time and still get 26-28mpg

 

i think ive read the best fuel economy for ls1's with the m6 is right around 63mph.

with mine, all stock, m6 i can get 30mpg highway and ill average 21mpg with city/and some 55mph roads.

they definitely dont get enough credit though. not many cars can get 25mpg and put down 310hp.