eheh, the main clue is the accel+up control method, the confirm is the fuel :) I didn't know about game ports, i'll go to find out...
Question time: In RallyBike, the fuel is the time, so there is no strategy to preserve fuel by using less or more the "+up" movement. But in your game how it works? because i've configured the gamepad (via the xpadder prog) with accel+up in a single button, and i'm afraid to consume more fuel :P