During the Pay At The Pump challenge, step on the gas all through the track. Put a big enough lead on Bobby Labonte and Sterling Marlin so that it is about a two to three second gap. You will run out of gas at the exit of turn four, depending on how hard you have been pushing the car. If the lead is big enough, just block and you will win the challenge. This may take a few attempts, but if you drive the car correctly it will be an easy way to win.