I expect than reported gas mileage improvements with K&Ns on modern computer controled engines are placebo effects. The engine management system maintains design fuel mixture over a wide range of inlet conditions so small changes in inlet restriction should have no measurable effect of fuel economy.quote:
Originally posted by Boeing 757 Pilot:
Hello Guys,
I was wondering if anybody had any noticeable gas mileage increase when using a K&N air filter?? I have one on my Z06 Vette and haven't noticed any increase while driving on a 750 mile road trip. How much horsepower will they make compaired to a paper air filter???
How much extra power is a function of how restitive your stock element was. Late model Corvette air filters tend to be big and any improvement over a clean paper filter would be so small as to be difficult to measure.