best air filter?

[Khill]

the search function is buggin out at this time so ill post this for now. What is the best air filter on the market? I have an 04 Trailblazer LT and am trying to do everything I can to boost gas mileage now that I happen to have a lot of free time on my hands. I have seen various "test results" posted on the internet by everyone from manufacturers to good samaratins and some say that this filter is better and some say none is better. And I have run across a conculsion that "better filtration and better air flow" is a contradiction in terms physically. What are the repercussions of using a higher flow, lower filtration filter?

Also, does a high flow exhaust help mpg? if so, any reccommendations?

So I just wanted to throw this out there and see what the opinions are. Is it a good idea to shop for certain filters or am I just looking to waste my money?

[KiwiBacon]

A high flow exhaust can help MPG, but usually only if the stock one is really really restrictive.
A more free flowing air cleaner won't help MPG, a warm air intake may but it will reduce power at the same time.

[J-Ri]

bobistheoilguy.com did a test on this. The factory paper filters flow slightly less, but filter much better. Hi-flow filters don't filter near as much, but do flow slightly more. That extra flow is unnecessary unless you're revving it way past redline. Someone figured on a 3.8L engine, you would have to rev the engine to 12,000(?) RPM before the extra flow would be needed.