Most boats have a water separator with a capacity of at least a pint or more. I don't believe most cars or trucks would be able to tolerate that much water without expensive damage occurring. The last time I was at the Toyota dealer, the labor rate was well over $125 per hour. At that rate, just dropping and cleaning the gas tank would be a $400 proposition. If other parts are damaged, the tab would be even higher and any warranty would not cover such damage. Unless you are absolutely sure the fuel is free of water or other contaminants, I would resist pouring it into any modern vehicle. One option might be to put it in the "free" section of Craigslist. Someone with carbureted equipment might find it useful for their snowblower, tractor or lawn equipment. For my purposes, trying to save a few bucks by storing and reusing the fuel doesn't seem to be worth the risk.