Not to advocate drinking (or becoming a teetotaller) but making your own is very easy. I mean, ridiculously so if you don't live in apartment.

And here in Sweden, due to the state having the monopoly on selling alcohol, vodka /is/ much more expensive than gasoline. 25:-/L for gas, about 150:-/L for vodka (and then it's the cheap stuff that tastes as if you're gargling with turpentine).

As to converting liters and gallons, I gave up when the article I looked at started going on about "eight quarts to a gallon" and imperial gallons and liquid gallons vs. dry gallons.

Me, I'm looking into converting an old pick up-truck for woodgas.