On Sat, 29 Jan 2011 13:25:34 -0800 (PST), Tim
wrote:

But I'd think it would be neat to make your own gasoline for your
boat, and even road use UP TO a certain limit, though.

It's an interesting idea but I think you'll find that the complexities
and costs will make it impractical. The big refineries spend a lot
of money on safety and process control but they get to spread the
investment over huge quantities. It would make a great magazine
article for one of the DIY publications however.