On the saito 30, in my texaco model I was getting around 3 mls per minute burn (with a 4 pound model) on 5,000rpm. I was using I think a 10x6 prop (nothing special), oil was the dreaded 15% and 10% nitro (CD supplied fuel) so I would expect with moderate handling that the 30 would fly for about 60 minutes + on an 8oz tank. I only retired it from the texaco model because the deisel I fitted is meaner on fuel and I get to supply my own and in the process don't "stress" the 30 with low oil content fuel.