Let's take a closer look at the particulars for one of the most common sizes, the pony keg. A pony keg is an informal name for the quarter-barrel keg, which holds 7.75 gallons in North America.

Mazda is celebrating 40 years of putting engines inspired by pony kegs in their cars by rolling out a special version of the RX-8 2+2. Mazda's official hyperbole about the RX-8 brags that the car ...