I received a free sample of Xtreme Fuel Treatment for testing purposes from a distributor wanting me to test it fairly. Here is the result of my test on a 1999 Toyota Tacoma PreRunner 2.7 Liter 4 cylinder with A/T and 124,000 miles on the odometer. Truck runs perfectly and was tuned up at 100,000 miles. Tires were at 32 psi and A/C was never run during this test.
Fuel Mileage 1999 Toyota
10 Tanks of Regular 87 octane Shell
Tank 1 without treatment = 19.5 mpg
Tank 2 without treatment = 20.3
Tank 3 without treatment = 20.8
Tank 4 with treatment 1/2 ounce = 16.9
Tank 5 with treatment 1/4 ounce = 17.4
Tank 6 with treatment 1/4 ounce = 19.4
Tank 7 with treatment 1/4 ounce = 20.0
Tank 8 with treatment 1/4 ounce = 19.0
Tank 9 with treatment 1/4 ounce = 20.1
Tank 10 with treatment 1/4 ounce = 19.8
As you can see in the beginning it actually hurt my mileage and then on the 3rd treatment I was getting basically what I was getting before I used this product. Notice the first treatment when my mileage dropped by almost 4 mpg over the previous test without the treatment. I tested this product honestly driving as I normally do about 75% city and 25% highway. I was not trying to get good mileage nor was I driving hard to hurt mileage. The bottom line is that the product does not work and in fact in the beginning it hurts your mileage. This product is a 100% total waste of money as I suspected but I was open minded and gave it a fair test. The results are here for all to see. No hype, no fake testimonials, and no bull. This is like all other products that make these claims. They simply do not work so save your money.