I just got off the phone after calling a local business that sells racing fuel. They sell it for less than $4 per gallon if you bring your own container. That's a lot better than the $2.49 per quart at a local pharmacy, and will be a lot faster to fill the tank.

Thanks to everyone for their suggestions, and especially to Frozengator. I hadn't thought about racing alcohol. Now with the money I save on the antifreeze system, I can afford to buy another drink or two the next time I'm on an airline! Sadly, it won't be good Moonshine, and unfortunately it won't be on a Gulfstream II!!!

GGB