MK I or MK II (non-TDI) VW Diesel hands down! I could get 60mph highway. Hypermiling (shift soon and keep it floored) really helped get better fuel mileage. The non-turbo editions didn't have hardly any power, but are dead simple, hardly every die (as long as you don't wait too long to change the timing chane) and cheap and easy to work on.
__________________
|