So for all of you who have ever wondered, this is how the average car or truck engine works. The blue is when the gas and air comes into the cylinders; the red/yellow is when the fuel com-busts and; the gray is when the exhaust is expelled. With Green Fuel Tab Products there is better combustion, less exhaust and reduced emissions. That's why mileage improves 10% to 20% and up to 70% of the emissions are eliminated. The Green Fuel Tab formula produces the best MPG products and is a true green fuel technology. Isn't science wonderful!