I was just about to ask about these myself, but found this thread. On a Mazda forum my wife and I look at once in a while, someone with a Mazda3 states that after they put in a K&N Air Filter that they gained about 20 miles per tank of gas. Does this sound reasonable, cause if it is, I will likely go and put one in my 95.
http://www.mazdaforum.com/m_78711/tm.htm
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Hey, you want to lay the fate of the world on the kid's Camaro? That's cool.
I bought a car, turned out to be an alien robot. Who knew?