RZR burning oil too fast?

I changed my oil in the spring. Since then I have ridden about 300 miles. Right before my trip to Hatifiled McCoy I add about a 1/2 quart to fill it up. I checked it yesterday, after riding a hard 100 miles of trails over the weekend, and it's low again. I have a power commander on it and aftermarket exhaust. So I'm not sure if that has anything to do with it. It does not smoke when started or when running. And, it runs great. So is this normal? She has about 2,300 miles on her. I am changing the oil in the next couple of days with Polaris oil and filter.

Any useful input?