Fuel economy vs speed

Submitted: Thursday, Apr 03, 2008 at 10:31
ThreadID: 56230 Views:3798 Replies:17 FollowUps:24
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I think it's safe to assume we have all heard that keeping to 80 kph will save heaps of fuel compared to doing 100 kph, and this is probably heavily related to the number of revs the engine is doing.
However, with an auto transmission, does this apply when at 80kph the car runs at 2100 revs, but at 100 kph, overdrive has cut in, and the engine drops to 1800 revs.
Higher speed now means less revs.
Based on no hills and no head or tail winds, are there other factors applied that would affect the fuel usage to make the original generic statement wrong, or does the benefit of the lower revs get counteracted by the increased wind resistance with the higher speed?
Cheers and thanks
Ian
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