jWe use it for dyno testing since it is easier to get than race fuel, is less expensive and it works better than a lot of other fuels. But that might not be the case for other folks. The dyno shop that I work with is located fairly close to a rural airport. Some airports will pump Av gas into containers and some wont. All depends on where you live and who you are. The dyno shop has trouble getting race fuel delivered and it is a long drive to buy it.