Well lets just take my first tank full wich was a test and a prosses of tunning in the hydrogen. I went from 240 miles to 285 on 16 gallons. This was prior to leaning the VX out buy drilling holes and covering them with a filter. I have no warrenty on the truck and I built my motor myself. I wouldnt trust the monkeys at the dealer touching anything. Ive never seen 285 miles out of a tank before so id have to say thats hard evidence, atleast to me. Id post some pictures but im not a paying member so I cant post any pics.