According to this article, we can't use ethanol based gasoline during Passover because of its corn based contents. This is the second time ethanol gas wrecked a good motorcycle ride. Apparently it does a very good job of cleaning out the gunk in your gas tank. Only problem was, the gunk then goes into your carbs. More detail here. I had to take my bike to the shop to get the tank drained and the carbs cleaned before the bike would run again.
And yes, I know the article was a joke. Nice thought though. :-)