My 89 F150 I-6 gets 20 MPG average with a BW T-19 4sp trans and 2.73's. I have a 2003 Jetta TDI wagon that gets 55 mpg all day. My 95 T-bird gets 33 mpg (lots of mods, like the F 150) and my wife's cougar (95 as well) gets 26-27mpg, same motor as my bird, but stock. The killer is my F350 PSD. I get 23 on the highway and when I'm towing my 31' Airstream Sovereign I still get 16.5-17.5!