Yes, gasoline has more BTU's than alcohol. However, the correct mixture for methanol is twice that of gasoline. Therefore, even though methanol has less power potential unit for unit than gas, you are burning twice as much and therefore make MORE power not less. The inherent cooling effect of methanol in the inlet tract further increases power. And lastly, if an engine is purpose designed to run methanol, it can be built with a higher compression ratio, which increases power further yet.

Methanol powered engines make more power than gasoline.

The problem with your Super Tiger engine is that it will need to be converted to a roller bearing on the rod so as not to have to run so much oil in your fuel. Super Tiger recommends 10% oil in their large engines, while normal gasoline engines run from 2 to 3%. If you ran 10% oil in a gasoline setup, you would probably encounter problems with carboning up the engine.

AV8TOR