Quote:
Originally Posted by Eddie25
However the same trip now took me 1 hour and 20 min. Which means i drove for 20 min more and had the engine run for 20 min longer
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Yes, the engine ran longer, but at lower RPMs, therefore using less gallons per hour.
How much less?
That depends on lots of factors, mostly how much extra fuel was needed to overcome the aero penalty of an extra 30kph.