Don't know about a Profi motor, but the Norvel .06 control line one says 250 grams / hr. That would be what , maybe seven minutes on 20 cc. I think something revving higher would be a bit more thirsty but not double. Having said that, the Fora carb is 7 mm, compared to a TD, which is less than 3mm. I would guess the Profi is similar.