If you're really concerned about economy, then less speed is better - there's a hinge point around 55 mph where more speed dramatically increases wind resistance and mileage suffers. Below that, wind resistance is a minor factor toward achieving better mpg. But who drives 55 right?
Maybe try 60 for a day, see if you're a more relaxed person for it.
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Cheers!
Scott McPhee
1987 300D
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