Thats insane... I'm driving a 4.0 and I'm only getting BARELY 15.
I have a 1997 5.0 XLT, 270K, original engine, trans, rear end. this summer puling a 8' loaded trailer and 4 people in the truck from LA to Sequoia at approx 65 mph I averaged 19 mpg. Man that suprised the heck out of me. The thing still runs great...Ive run Mobil syn oil in her from when she was band new, I change all fluids yearly..I hope i an get another 100k.
u got less then a 20 gal tank?