2018年1月8日 · I have one of each and my LS4 get's better gas mileage on the highway. I get like 25 on the highway with the GXP on premium gasoline and like 20 with E85. I have an overkill tune and an ethanol content sensor so I can run the E85.

2017年3月26日 · 30mpg would be awesome. My 2015 5.3 6 speed auto Crew Cab has gotten a best of 23mpg interstate @ 80mph and I average 18mpg around town. Much better mpg than the previous 6.0 4l60e Crew Cab I had. Anywho 30mpg with an auto would be cool.

2023年2月2日 · Let’s say you spend an extra 3k on the LS conversion over conventional Chevy. If you average 15 MPG vs 22 MPG for the LS you would break even dollar wise after driving 40,000 miles @ $3.50 per gallon of gas. At the end of the day you have to decide which way to go. Personally I like simple.

Find information about GM's 5.3L V8 LS4 engine used in the Chevrolet Caprice PPV, including detailed info and specifications, vehicle applications, and more.

2003年3月31日 · The ls4 has more HP per liter than last years 4.6 liter DOHC toyota engine.....and I recall someone defending the power output of that engine.....and the 5.3 still gets as good if not better fuel economy than toyota's 4.6.

2005年9月22日 · Based upon the posted numbers, the Hemi makes 12.2% more HP (340 divided by 303) and the LS4 and gets 12.0% better mileage (28 mpg divided by 25), so it looks to be a wash as far as engine effeciency goes.

2017年1月1日 · I have a 1988 (square body) V2500 Suburban. Its got 60/14 swap, and a built TH400. 4.10 gearing and 35" tall tires. I get 14-15 mpg with it. If it had OD I'd probably get 16-17.

2021年12月10日 · My 5.3 liter LS "LM7" Gen 3 motor out of a 1999 GMC Sierra with a 4L60E transmission and 2.73 gears in the differential gets around 25 MPG on the highway. And I'm probably averaging 18-20 overall combined in town and highway on an unmolested, stock, never been rebuilt engine with 156,000 or so miles.

After 6.5 years and 55K miles, the LS4/F40/E67 swap had a DoD lifter failure in September 2019. This was my opportunity to make some major improvements from the current 382 whp and 29 mpg. The high level goals for this next round of upgrades are 550+ whp, 2899 lb …

2018年3月15日 · The LS4 engine is a Gen. 4, 5.3L, aluminum small block engine used in GM cars between 2005 and 2009. It is unique because it was the only LS engine used in front-wheel drive vehicles. The FWD LS4 had cathedral port cylinder heads and …