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Back when i had my civic i used a hot air intake to good effect. I made it with a length of flexible aluminium duct and fitted one end to the air intake and wedged the other end behind the catalytic converter, just under the exhaust manifold. Intake temps got up to 80c during the daytime and she ran lean as! Mpg went up by a few, about 5 or 6 iirc. Unfortunately i have hills, school runs and very changeable weather to contend with so it made it hard to pin down the exact mpg gain. But you are in AZ so you should be ok!
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