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
My 6.0L 3.73 gets 8mpg towing at 67-70mph, 14mpg in my wife's mixed around town driving, and as high as 18mpg non towing highway. As I said, that's 2mpg better than my 2003 F150 5.4L over the 75k miles we owned it.
All wheel drive is not inherently bad. But the system mated to the GM 6.2L seems week. I have read about failures handling the 6.2L torque. The 6.2L is also all aluminum and IHMO not up to the task of 100% TV duty in high temps. I think the axles are also weaker in the SUVs than the half ton pickups GM put it in. 2007 is first model year for 6.2L, GMT900 SUVs, and the 6-spd. I have not heard too many first year troubles specifically, though.
I'd take an 8.1L 04-06 3/4 ton any day for dedicated TV. They are just almost impossible to find compared to 6.2L newer ones.
All wheel drive is not inherently bad. But the system mated to the GM 6.2L seems week. I have read about failures handling the 6.2L torque. The 6.2L is also all aluminum and IHMO not up to the task of 100% TV duty in high temps. I think the axles are also weaker in the SUVs than the half ton pickups GM put it in. 2007 is first model year for 6.2L, GMT900 SUVs, and the 6-spd. I have not heard too many first year troubles specifically, though.
I'd take an 8.1L 04-06 3/4 ton any day for dedicated TV. They are just almost impossible to find compared to 6.2L newer ones.
