After the 2001 SAE contest here, the fuel on board rule was changed for multi-motored planes.
It had been interpreted as 4 ounces total.
For the multis, which used 4 motors, this meant only 1 oz per motor, which led to some magnificent choreography on engine start, with all 4 starting at the same time, and the plane released immediately, hoping the motors wouldn't conk out in flight. They tended to, which wiped some really expensive airplanes, so the next year the rule was changed to 4 oz per motor, which made more sense safety wise, and cut down the number of crew persons needed to operate the plane.