Very scared of breaking a motor due to an irregular and unreliable supply of fuel.
Right now the car isn't tuned on the edge so there is some leeway in the tune-up but when it gets more serious amounts of boost and timing, it'll be closer to the ragged edge and I don't fancy filling it up with fuel that has sat in a half-empty tank in the ground for months because no bastard is using the stuff yet.
Fuel in drums is more consistent and that's what I need.
That said, VP are releasing Roo-85 shortly.