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Old 08-21-2012, 07:02 PM   #8 (permalink)
gone-ot
...beats walking...
 
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...an overdrive "shifts" (pardon the pun) the engine RPM's at highway speeds down into the 'slower' 1000-2000 RPM range where the engines' SFC is "least" for "power" produced, ie: the "best" fuel-economy area of the engine operation.
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