Quote:
Originally Posted by basjoos
High humidity improves mileage since water vapor has a lower density than nitrogen, oxygen, or CO2, so high humidity reduces aero drag. It also de-rates the engine's power since the water molecules displace some of the oxygen that the engine could be sucking into the cylinders, so the ICE burns less fuel, also improving mileage.
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Cool, humid days seem to offer the best FE -- especially in the morning hours (even with the warm-air intake).
The Physics makes sense.
RH77