We avoided rain... all the cars were parked in the pit garages before the event, too.
Reading up... seems like a big issue with such small figures... 10 pounds versus 1 gallon is a pretty big level of error.
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The big problem was the fuel sponsor would not allow refueling at the track...
at all, which was maddening. In an ideal world, both methods would be used to audit each other.
So... I guess that leaves removing a washer nozzle, running a hose out to a bottle of fuel suction cupped to the hood, and running until the bottle is dry?