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Old 08-12-2008, 08:44 AM   #11 (permalink)
Mechanical Engineer
Join Date: Jun 2008
Location: Richmond, VA
Posts: 190

The Truck - '02 Dodge Ram 1500 SLT Sport
90 day: 15.15 mpg (US)

The Van 2 - '06 Honda Odyssey EX
90 day: 22.63 mpg (US)

GoKart - '14 Hyundai Elantra GT base 6MT
90 day: 29.17 mpg (US)
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I think a vehicle's response to humidity depends on the engine and ECU configuration. My truck responds favorably to humidity in cool conditions but unfavorably to hot conditions (whether humid or not). I think this is primarily affected by the spark timing and the knock sensor. Humidity should improve knock resistance and therefore should prevent spark retard. The temperature side of the equation easily overcomes the influence of humidity on my truck, so when it gets hot it doesn't much matter if it's humid I think there are times that the spark gets pulled back. Plus I run my A/C as I really don't tolerate heat very well, and the A/C probably stays engaged more in humid heat.

If your vehicle doesn't have a knock sensor I don't know if you would notice a difference unless in dry conditions your engine knocked, then it may reduce your mileage from preignition opposing crankshaft rotation.

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