Quote:
Originally Posted by 97one
I know in hot weather my car gets slower run times then it does in cooler weather,even with 10 degrees difference.
What about Humidity & heat ?
Would high Humidity alone ( at same temps. ) make a car run slower ?

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I stole this quote, because its worded better than I could do.
Rick Martin, an engineer with Yamaha Marine (800/526-6650; yamaha-motor.com), explains, “Humidity is water vapor. In a given amount of air, it displaces oxygen content, making the air less dense. As a result, the engine ingests less oxygen, and its output is reduced.