Xtreme Green Fuel Max Plus+ One Shot Does It All! Boosts Power and Performance - Helps Improve Fuel Economy for Gas and Diesel (Pack of 6 x 20ml bottle) Don't fill your tank up without Fuel Max Plus+ One Shot Does It All! A super concentrated fuel catalyst designed to help increase mileage and horsepower while reducing harmful emissions. Boosts Power and Performance. Reduces Harmful Emissions. Cleans Carbon Deposits. Improves Fuel Stability. Adds Lubricity to the Fuel. Reduces Exhaust Smoke. Helps Improve Fuel Economy.