I know in boat racing the driver has to pass a medical before being allowed to race. It is good for the season for all the HRL classes except for GP who have to have a minor test (BP and heart rate) before each race weekend. It is a pilot grade test.
This full medical test goes back to at least the mid '70s when I raced boats.
There was only 16 squadrons of RAF fighters that used 100 octane during the BoB. The Fw190A could not fly with the outer cannon removed. There was no Fw190A-8s flying with the JGs in 1945.