Can't comment on anything except the zdz40. I have one in my DP Extra and am in the process of switching the tank out for a smaller one. I have a 24oz tank right now (I know...but I never had a gas engine before ). After a ten minute flight of various throttle settings I have half a tank left or more depending. I think I will switch it for a 16. Should have a good safety margin after each flight that way and take up much less fuel. No point in flying around with twice as much fuel as I have to. Going to use the 24oz for my new Extra with ZDZ80....should be perfect.