[Mike Croley]

There are reasons why race gas fails fuel checks. And one of the rarest reasons is test equipment or calibration. Handling of race gas by the racer and the supplier is the single most important reason for problems in fuel check. I've posted these before, but here they are again for reference.

Don't store race gas anywhere that it sees direct sunlight or where it receives large swings in temperature, inside a race trailer for example.
Don't ever allow containers of race gas to sit on the ground, concrete,asphalt,or metal. Always place containers on wood planks or wood pallets.
Cap race gas containers as soon as possible and keep them sealed tightly. The vapors you see escaping when the lid is off, or when pouring from one container into another are called light ends and you want them in the container, not floating away.
Never mix old race gas and fresh race gas if you want to be sure to pass fuel check.
Purchasing race fuel in sealed containers is the best way to make sure your fuel is fresh. Purchasing from a tank is fine as long as the tank is properly maintained.

Some racers don't do any of these things and still pass fuel check, but better safe than sorry.