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I figure my intake air gets warm enough just from the tightly cowled engine compartment (its completely underpanelled, with a mostly blocked grill and the hot radiator air exhausted out through the front wheel wells). They've had some discussions of warm air intake temps at Gassavers and concluded that although warm intake air improves mileage (at the expense of power, you are in effect driving a less powerful engine with a more open throttle plate with reduced pumping losses), but if the intake air gets too hot, it has detrimental effects on mileage (perhaps because the engine ECU isn't programmed to handle intake temps that are way above what its programmers thought it might ever experience).
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