with my 93 f150 4.9l 5spd 4x4 126,000. ive averaged 11-14mpg in winter with hubs locked in. summer i averaged 15-16mpg and ive seafoamed it twice and went up north in wisconsin to the pipeline with my spare in the bed and back of my cab filled to the top with camping gear and bed full of wood and i averaged 19mpg on the hwy, this really impressed me. now i got 5.0l injectors installed (20#) and im going to try and see what i get now.