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Yea on alcohol fuel, this could work. A lot of engines will ping on a hot day, and a warm air intake is like simulating a hot day. The thermal efficiency at full power will drop even without pinging because of the higher temperatures, but if you are just cruising down the freeway this could buy you a few % more gas mileage.
I wouldn't do it on a car that isn't flex fuel (aka, has way too low of a compression ratio for E85) or natural gas (very high octane fuel). Maybe block off the intake during winter so it sucks engine bay air rather than cold outside air, but that's it.
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