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As I understand it, Cold Air Indtake will allways be best for the effencicy of the engine. How ever - we most of the time drive on the first 0 - ½ inch of the accelerator, and only minute changes at the foot, can cuse one to use too much fuel.
By making a Hot Air Intake, you reduce the efrencicy of your engine, which means, that you now have to push the acc further down to achive the same speed.
The thorttleplate will thus be opend more.
Wheater or not this in itselves should lead to more mpg I really doubt, but having a wider range for your foot on the accelerator might be what generates the better mpg.?
But then again - I don't know much about HAI's and the theory behind it - but I understand the CAI in details.
I my car It's someehat diffucult to control the acc with the right accuracy, and just a slightly to hard a push on the acc, will cause FE to god down.
As for engines with Lean Burn technology - things about HAI might be different I suspect?
Don't konw anithing about those...
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