Quote:
Originally Posted by aerohead
The following are from a CAR and DRIVER road test of a VW Rabbit Diesel,reported,November 1979, measured at constant highway speeds (probably at Chrysler Proving Grounds which is just a hop skip and a jump from C&D's office at the time)
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80 mph = 27.0 mpg
75 mph = 30.0 mpg
70 mph = 34.5 mpg
65 mph = 41.0 mpg
60 mph = 47.0 mpg
55 mph = 52.0 mpg
50 mph = 57.0 mpg
45 mph = 61.5 mpg
40 mph = 62.5 mpg
This car may be a bit different but the trend line may be similar for the speed differentials.
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That was kind of my experience with my Chevette. As near as I could figure, it's drag coefficient was somewhere around .45, which is horrible. When I tried to pulse and glide with that much wind resistance against a 2,200lb car, it was like I was throwing an anchor out the window. Low speeds is your friend in any boxy-shaped vehicle.