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      12-31-2011, 02:25 PM   #3
sfax
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United Kingdom
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Drives: BMW X3 2011 F25
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Surely efficiency is based on choosing any route where you can drive at the most efficient speed for fuel economy, i.e. not too fast (freeways/motorways) and not too slow (inner city traffic). Quickest will often be longer than shortest and most efficient will sit somewhere between the two.
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