Scott I totally agree I have a 1999 Chevy Tahoe 5.7 liter with the 4l60 transmission with 3.42 axle ratio and 205,000 miles it gets 16.5 average miles per gallon. I also have a 2014 Chevy Tahoe 5.3 with active fuel management/variable valve timing 6 speed tra... Login to read more.