How Many Ounces Are In A Keg Of Beer?

Nick and I discussed buying a keg or two for our family trip. Researching on the web didn't find too much except this: http://www.cockeyed.com/inside/keg/keg.html. This site has lots of photos of the experiment of how many ounces are in a keg.

According to this site, one keg served up 141 Red Plastic Cups of beer. This equals to six cases or 165 cans of beer.

We usually go through, maybe, three cases of beer a night on these drunken family trips. So maybe, two kegs would be enough? It comes down to about 50% of the cost of bottles or cans. Can we fit two kegs in the Car?

See our dilemma?