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
Marc is right. Either it's a Y2K or newer or it's a 5.7. 99 Tahoes, Yukons, and Suburbans were the older body style. YukonXL and Suburban 2500s were also available with the 7.4.
