I have an 88 560SL. I average about 15.5 mpg mostly high speed highway. On long trips at moderat speeds under 70 mph I will exceed the factory sticker milage of 17 mpg. The factory window sticker says 17.0 highway and 14.0 city. This is the first car I have ever known to beat the factory sticker milage. Not that it's good milage but at least MB has some integrity.

John Roncallo