Quote:
Originally Posted by Duffman
1) Warm air is less dense so there should be less aero drag.
2) You are getting the warm air intake effect.
3) Less warm up time but also, parts are looser, oil is thinner etc.
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Bingo. Like #3, even if the engine is warmed up, other fluids are warmer and flow easier too, like trans fluid, diff fluid, power steering fluid, wheel bearing grease... it all adds up.
Also the air pressure in your tires changes with temperature, so higher temps = higher PSI and less rolling resistance.