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I have a 2003 Jeep Wrangler. I bought the K&N filter, it did nothing. Just nice to have since you can clean it without having to buy a new one. I put 31" tires on mine and I lost about 60 miles per tank, no joke. I was getting 220-240 miles per tank, threw them on and now I'm getting 170-180 on a good tank which measures out to about 12.5mpg so I'd stick with your stock tires.
My girlfriends brother has an F250 Diesel, lifted about 4" with 35" tires on it with 20" wheels. Now, he has it chipped and keeps it on fuel economy mode, claiming to get about 18mpg. He also has the K&N cone filter as well, but not sure if that made much of a difference.
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