Every auto and engine manufacturer I know of says to NOT use methanol in their engines; if you do, you void the warranty.

I'm not a chemist but I'd suspect the tiny molecule might be a wee bit hard on the various gaskets in the system. I'm having no joy with Google but as I recall there was an Icelandic fishing boat that got converted to MeOH as a proof of concept; lots of CO2 and cheap electricity is available there, whilst diesel is hard to come by ...