How much (gas included) would it cost me to see Game 3 of the NBA semifinals in OKC?

I don't have an answer, just some advice - look up ticket prices, find where you'd be fine with sitting - see how much those tickets cost, then look up the driving distance and calculate your gas price.... (in fact if you go to a trip planning website, they'll actually calculate the price for you based on local gas prices throughout your trip)