The "Diesel Air Filter Cleaner" can save 3-5 gallons of fuel an hour for any large diesel vehicle. Now when you think of it, when you have multiple vehicles out in a field for 15 hours a day, that's a whole lot of savings! up to 225 gallons a day, if your running 3 combines for 15 hour harvest days, with diesel fuel reaching roughly around $3.75 a gallon that's $843.75 savings a day! And if you have a semi, or even multiple semis out 8 hours a day every day the savings will sky rocket! So if you really wanna get the most out of your yearly income this product is a MUST!!!