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[philhoward]

Ironically, a warm yet misty morning is probably the theroetical most efficient time to drive as the water vapour in the air makes for a more complete (read efficient) burn, so more "bang for your buck" as they say.  The warmer air doesn't affect modern injection systems - but it will decrease the air density, hence the drag on the vehicle.  The fuel/air ratio will be unchanged is its 14.7:1 by WEIGHT - not volume.