that's funny,,jajaja I dont keep track of it, the only thing I try to remeber is how much fuel has been run on my engine so If one day I sell it you can tell if it's still good or not,,, but who would want to sell a DA-50???? not me and if I did it would be for another DA but this time bigger!!!!! So far I got 3 1/2 gallons of 32:1 in 6 month that's my logbook!!!!