I broke-in my Webra .50 Speed yesterday and recorded the following figures after three 14oz tanks ran rich just breaking from a slight 4-stroke.

Fuel was 20% castor, 80% Methanol (Nil Nitro).

APC 12x4 13,200 peaked.
APC 10x7 14,000 with room for more. I didn't want to push it on a new motor.