How does your LS1 fuel mileage compare to your old motor?

[Carwhisperer]

I'm thinking about 2 different engines for a swap into a small hot rod, LS1 or 2002 4.8. What fuel mileage do you get in your LS1 pickup and what body/drivetrain? Since these motors never both came in the same chassis you can't really use the EPA ratings to compare them.

[Atomic]

Well the 4.8 will get better mileage....less power, smaller cubes, means less fuel.

[Clyde65]

I have not gotten my 4.8 tuned other than the basic, removal and get it running tune. I get around 13 in the city, should be around 17-18 on highway if I would run it on the highway. I hope to get a real good tune so it would improve along with HP an performance.

[Old Nash]

The weight and rear end ratio of hot rod is going to make a difference in mileage you get

[Jake Harsha]

I put a low-mileage 2007 LQ4 in my Jeep. Orignal 258 six got around 16 MPG. The Ramjet 350 I put in after that got about 12-13 MPG. With the 6.0 liter it gets about 14 MPG (and I drive it like I stole it). The 5.3 in my 99 gets around 15 MPG on average.


Jake