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
Keep mind the display in the truck is the average of how the previous owner drove the truck. When I bought mine it showed 9mpg! After driving mine for a month I was averaging 12.5. And 15 hwy. I will say that the 6.2 will more than likely get better mileage towing than your previous 5.3 because it won't be working as hard!
