i second that lol.... theres a brewing forum...just a heads up man...wish i could help but i have no idea
how long does a tank of gas last? how often do you drive? what kind of mpg do you get? how big is the gas tank? help us out here.
The number of taps is irrelevant. It depends on how much beer you're pushing. If one pound of gas can push one keg of beer (not saying it can - just an illustration), it doesn't matter if you've got one tap, thirty, or a thousand. It's still going to push one keg.