Quote:
Originally Posted by NeilBlanchard
Hot weather has two benefits to higher efficiency: quicker warm up time, and lower air density means that aerodynamic drag is significantly lower. My car coasts far better the warmer it is - I can almost tell the temperature by how far I coast. Also, higher humidity also lowers the density of the air (counterintuitively).
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My data shows the same for humidity. Foggy mornings are the best.
Not only quicker warmup and lower air density for drag. Also tires have lower rolling resistance, all the grease and fluids start out flowing better, and the lower air density basically "detunes" the engine to be less powerful.