Quote:
Originally Posted by Walkenvol
At what rpm's does it start cutting into the fuel efficiency or is it mainly the wind resistance of the higher speed? The gearing on my 201 is pretty low such that 70 mph is slightly over 3400 rpm's. The car appears to handle it with no problems with plenty of pedal left to go much faster, but it sure sounds wound up fairly tight compared the the gassers with OD turning 2300 rpm's at 70.
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Running at this speed I have had several tanks at 26.2-26.7mpg. However, now that the winterized fuel is out it has dropped to 24.8-25.6mpg. A few years ago I used to buy 100% commercial biodiesel that was locally available for a period. I would like try that on this trip. She is a little loud at these speeds, yet she drives GREAT. How I love the ride and handling of a W123.