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I don't think a HAI will help a vehicle with a MAF sensor, as the Focus doesn't seem to use more gas with a lower IAT, the Jeep on the other hand does benefit. Fully warmed up (35 Mile drive to my girlfriends parent's house) it uses around .45GPH at Idle with an intake temp of 65*, and around .32-.38GPH with an intake temp of 110*. I tested this on 1 trip, when I got there I let it Idle for several minutes as the intake temp increased (due to less air flow through the radiator and engine compartment), once i got back home I opened the hood to let cool air into the intake and again let it idle for several minutes. I'm not sure how much difference this will make at highway speeds but it does show a positive effect at idle.
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