Everyone has heard the claims before and many products have proven to be ineffective. We know our claims are hard to believe. We can show you all the test results in the world, but the only way you will know for sure is to test it yourself.

Take the XADO Challenge. We are so confident in our product, we guarantee you will see an increase in fuel economy by at least 7%, increase your engines compression and reduction noise and vibration or we will refund 100% of your money.

All you need to do is try it out. If you don't like the results, send us your package, proof of purchase and a description of your experience and we'll refund your 100% money for up to a year from date of purchase. Just send it to US EnviroTech, 3020 McCoy Place NE, Albuquerque, NM 87106.