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

[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