Each 2oz bottle treats 80 gallons of gas. A pinhole under the cap controls the flow of product. The side of the bottle has markings for every 5 gallons so you know how much to treat. A tiny squeeze is all you need -- perfect for treating motorcycles or small equipment. AND DurAlt lets you use Regular gas versus Premium with no loss in performance! The 2oz bottle makes an inexpensive gift for someone and is perfect as a Holiday stocking stuffer. Each bottle costs only $10.99, but will save over $31 in fuel costs at $3.95/Gallon on regular gas.  We recommend always keeping bottle upright and in a ziplock bag when stored to prevent seal saturation and leakage.