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Originally Posted by FW28z
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On one hand, denser air would suggest more air drag (less MPG), but colder air might mean better combustion. Do these offset each other somewhat?
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No. Not really. Not in a significant way.
Increased air density due to colder air leading to greater aerodynamic drag is an accepted fact.
Colder air can increase an engines maximum power output at full throttle because the air is more dense, but since most gasoline RVs don't operate at full throttle, then this in itself doesn't affect efficiency significantly.
In theory the thermal cycle of an internal combustion engine is improved with colder intake, but the difference is very minor. Certainly less than you could measure.
If your tabs are indeed the only variable and therefore responsible for almost 10% improvement, then I'd be extremely happy with those results.
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