Unlimited fuel, for free, from the the gas station in the Little States.
to find it:
the space shuttle launch pad in Florida and the Mississippi river
(Georgia), locate the gas station on a road junction in the southeast.
Land in the parking lot, between the sign and the building, then cross
or touch the center line and your fuel tank will fill automatically.
you're flying the Gyrocopter, don't come to a complete halt or the stage
trick works in any of the Little States stages.