did a night drive from Yuma, AZ to Tucson, AZ at a steady 80MPH in my 94 jetta, 46MPG(4cyl gas engine)... Ohio to Maine two weeks ago in the passat, 34MPG riding at a steady 70MPH (usually get about 28-30) total from Maine to Iowa and back was 32.6 there was section from Iowa to Ohio there was a drop to about 30MPG, when I was going 55-60MPH.