I have read that the estimated highway mpg for my Windstar is 17. On a recent trip from the central coast of Oregon to Los Angeles and back I kept track of my mileage. The lowest mpg was while driving in LA both on the interstate and city driving. That was 21 mpg. The best mileage was 25.5 mpg on the interstate and that was mostly driving through mountains. I estimate that if I were to drive interstate through Iowa and Nebraska my van would give me 28 miles per gal.