I'm got 19.5 mpg on a short highway trip through small towns every so often on a 75 mile trip the first day I bought this truck, 2006 Silverado, 1/2 ton, 5.3L V8, AT, AC on.
This week, almost all city driving, I got 20.5! AC on about half the time. Certainly can't complain about that!
Problem is my fuel gauge will not go all the way to full! Bummer. Is this a bug? A commonality?
The pump shut off first time at 8+ gallons, and I could not believe that was all I used all week, as the attendant was hanging up the hose. I told her to put it back in. She did and got probably 2 more gallons in it. I paid, and pulled away to set my trip meter, and the thing registered only 3/4 full. I waited. Stayed there. I backed up to the pump and had her fill it again. 1.5 gallons. Went up to 7/8's full and thats as far as she'll go.