Originally Posted by sageriders

My '06 4.4 now has just under 9000 mi. I'm using 89 octane at the advice and recommendation of my selling dealer, who recommends that fuel for all cars except the M's. I get 14.5-15 in the city and easily do 22 on the highway at 70-75 ACTUAL mph (i.e., 73-78 indicated). On a recent 5000 mile road trip, got as high as 26 . . . . I am well satisfied.