Not counting my five-hour drive to Omaha, roughly $200 per game. Usually $100 for food/booze for tailgate and $100 for tickets. I don't pay for gas or parking so add $40 or so.
$150(ish) per ticket, $10 Parking, $160 for total gas, $30 for stuff in the stadium, $30-60 for alcohol and then whatever at the bar. About $400 for just me.