Vortec: Too much engine? (Mileage questions)
Hi, I'm getting dangerously close up upgrading my 1999 Yukon with a 5.3 engine to a 2007 Yukon XL with a 6.2 engine. I was test-driving it today and saw the display list an average MPG of 11.5. Yik...
Forum Discussion
I have a Jeep Cherokee I6 that gets 22 mpg on the highway. Towed a 4500 lb TT to Death Valley and back, got 11.5 mpg. Have a 8.1L Chevy that gets 14 mpg on the highway and towed trailer to Death Valley and back. Same trailer same trip, got 9.6 mpg. Probably a lot of the difference would be that the truck itself weighs more.
