I'm under the impression that the tank size has been reduced to about a 20 ounce. I could be wrong here. In any case that would not pose a problem for most people and it helps keep the plane lighter since you won't be "bunkering" fuel that you probably wouldn't be using anyway.

With all the 50cc planes I"ve had I've never managed to run a 24 ounce tank dry before I was done flying for the round and usually had 1/3 to 1/2 of a tank left after landing using 50cc engines.