I'm really impressed with the gas mileage my truck is getting. It's a 4.2L Reg Cab XLT 4x4 5speed. My last 5 FULL tanks have been 19, 19, 20, 19, and 20. We even got 17 pulling our popup tent trailer. For a big truck, I think this is outstanding.

Mixed driving and 70mph and the highways.

 

I'd be thrilled with those numbers aswell.... My best to date was right at 20 mpg (all highway.) In the city, I'm usually right around 15 mpg.