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Where are you getting "The hotter the engine runs, the lower rpms, .. and the lower rpms, the less distance for the gas your consuming" from? the only time engine temp affects engine speed is while idling. You need Xrpm to get Ympg in any given gear you are in (auto's are not an exact ratio, unless they lock-up).
On warm/hot days, you need some flow through the radiator to keep the engine from over-heating. Pulling air into the back of the engine compartment won't do that, plus an additional fan will only draw more current from the alternator, reducing MPG.
I'm not flaming you, i do applaud your creative process! Keep it up!
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