On EFI equipped car there is an intake temp sensor, this sensor helps determine how much fuel to inject and how much timing the air can handle. Higher temperatures mean the air can handle less fuel before it goes rich, conversely the cooler the air the more fuel it can support. Since we here are not so concerned about peak power and high MPH, high intake temps are a good thing. My car for instance has manifold pressure based fuel mapping but the IAT (intake air temp sensor) determines the offset on a given map. I run a hot air intake (as seen in my garage) my intake temps run between 130* and 140* f compaired to the 78*f without, my fuel usage went from 1.5 gallons per hour (GPH) to just 1.09GPH at the same throttle setting (cruise 65 mph) this netted a huge gain in cruise milage. Again we aren't looking for low quarter mile times just good MPG's.
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