[lumberjack]

V6 less than 500 miles on it. Drive it like I stole it 80% of the time. Mix of dirt roads and highways. 17-18 mpg. On two 150 mile highway trips averaging 80 mph I got 21 both times.

Are your numbers calculated by the Blazer's computer? I ask because I've kept a manual log for my 2010 Equinox and its computer consistently averages two to three mpg better than my manual entries. Pisses me off.