My son Rides a 2000 KTM MXC and has recently started riding Hare Scrambles. For the 1:30 minute races in the summer, he hasn't ran out of fuel. He has the 3.2 gallon stock tank. The Winter series starts soon and they will run for 2 hours. He's a top of the Pack c rider or mid pack B rider. WIll he be able to make the 2 hour runs without refueling? Thanks