yeah I got about 8-10k on mine I'll probably recharge it here soon. I've always heard mixed reviews about the K&N. It does let in more air but also more dirt and debris. But I'll put the stock one back in till I get it cleaned.That's unusual, because most driver DO report a MPG increase and even a bump up in performance.
Your own driving style could also impact that.
But, it's worth the price, just to be the only air filter you'll ever need to buy for your car for its lifetime.
You will need the recharge kit though.
I take mine out and clean and re-oil it every 6k miles. (on every second oil change. (whether it LOOKS dirty or not)