I sent an email to K&N air filters asking why they don't make any claims about mileage. They basically said there was no way to establish a baseline. I sent another email politely suggesting how they could. They responded by saying I could look at their testimonials.
"The more you get out of each rpm and each drop of gas, the more power and more efficiency you will get. "
True.
"as long as you did not draw on that increased power...."
Exactly.
With K&N High Performance Air Intake Kits, You can gain maybe 8 HP but if the person that buys the kit drives to take advantage of the HP gain, then what they gain in power- they loose in fuel economy.
Also there's no (hardly any) mesurable increase in HP until over 3000 rpm. My truck's never seen 3000 rpm...
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