Supermouse3: And I would say actually that any (aluminium) automotive engine would run perfectly happily for far more than 2000HR flat chat. Liquid cooling ensures they stay at the same temperature regardless of power output
I wonder what number of hours they get out of the Super Car engines? Not 2000 hours I'll bet.
As to the use of MOGAS, there's STC's to run MOGAS with no limitation on leaning. The main issue with using MOGAS is vapour lock.