Ah heck, don't listen to those guys. 17 ounces is not near enough. Hack out room for a monster 50 ouncer and do an endurance flight. You might be low on fuel and have to land next year. LOL....just kidding. All the above mentioned are correct. 17 ounces is more than enough fuel for a normal 10 minute flight. Considering most 150 to 170cc class engines use approximately 2 to 2.5 ounces per minute at wot, a normal 50cc class will sip around an ounce to ounce and a half....if even that much. Take 17 and divide it by 1.5 (way over the useage max) and that gives you 11.3333 (infinite) minutes at wot. I don't know anyone that flies wide open throttle from take off to landing. Comparison example, my 3W 157cs will use about 20 to 22 ounces for a good 10 minute flight. I do sometimes open her up to wot for some high speed down on the deck inverted fly by's. But normally, really hardly get above 1/2 to 3/4 throttle. My 170 is right at about the same. Only my 212 4 cylinder exceeds this average. Usually around 30 ounces for a good 10-12 minute flight. So by comparison, a 17 ounce will be plenty for that DA 50.