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 don't think you'll notice a lick of difference in MPG towing with the 6.2 vs 5.3. You will appreciate the extra WB of the XL though,and the extra power. I don't believe the 6spd came in the 07's but this could be wrong.
