So here is my question for your consideration:

How much MPG improvement will you get with a new air filter? The commercials say "up to 10%" The Gov't says the same thing. I heard another ad say "up to 2 MPG".

I have thought about it and I think that in a fuel injected car, the savings will be minimal, unless you have been driving off road a lot or somewhere really dusty and the filter is clogged beyond normal levels.

I have not changed my filter in about 3 years and I have a new one ready to put in. I have a very accurate trip computer (ScanGuage II) that I have had for a while and I have it dialed in, so I can run a scientific test comparing old filter to new filter.

I am looking for ideas on what "scientific" tests to run and what results you expect me to find. I have some ideas that I have discussed with some engineers. Does anyone have any thoughts on this?

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra