I suppose it could be possible, but where are we going with this? Methanol
really isn't a cheap substitute for gasoline, and any dilution of a fuel
with a less energy dense fuel will proportionately reduce the energy
available. I know that is an oversimplification, but I still don't see why
we'd want to.
I'm reminded of the acetone additive posts. Big risks, small motive to take
them.
Mike