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assuming a new air intake allows as much air into the engine as it can get, you're likely to increase compression a bit, sure.
But a higher compression ratio requires higher octane fuel, otherwise the ECU will retard the ignition and lower your MPGs.
Trust your ECu; if it's getting good info from good sensors, it's designed to get the best fuel mileage possible within the contraints of the engine design. If you trick the ECU to run leaner, you'll burn pistons, valves, your head, or all the above. Run too rich and you waste gas.
However, if you run warm air into the intake, you can sometimes improve things, all depending on the engine. Otherwise, without redesigning the engine, there's not much to be done.
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 RIP Maxima 1997-2012
Quote:
Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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