I am averaging about 28mpg on mixed runs, tend to sit on cruise between 75-80mph, and dont boot it around town, but have experienced different cars which have better mpg at higher than normal speeds, quite a few have been better at 80+mph than 65mph. May have something to do with the momentum when hitting inclines, not causing a kick down etc.
Fuel wise, have been using Esso, but have thought of Shell or Texaco, interested to know members thoughts, plus what oil is most recommended?