It will be difficult to burn more than about 20 gal per with a rotary. Maybe as much as 30 gal with a turbocharged 20b.
Bill B
I was seeing upwards of 30 gph with my turbo 13B while running the pylons at Reno. That would be about 45gph with a turbo 20B. Course I was running really rich to be sure I avoided detonation.. Am trying to design a water injection system to use more boost and run a little leaner.