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post #2 of (permalink) Old 30th October 2009
Technical Supremo

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The optimum economical speed will vary greatly depending on the type, age, and how well the car is maintained and also driving style. There have been numerous studies worldwide and the consensus of opinion seems to be that when cruising a speed of between 55 and 65 mph would appear to be the best average for the average car.

As a matter of interest how did you calculate the mpg??
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