The Dyno-tab® XL package is designed for larger vehicles and commercial applications. The package has two closeable tubes holding 6 1.55 gram tablets each. Dyno-tab® XL is just the thing for RVs, buses, tractors, larger trucks, SUVs and marine. They are also ideal for fuel storage tanks and stationary engines such as pumps and generators. Go large. Go XL. For gasoline or diesel.