I have a Saito 125 for this plane and figured I would put in a larger fuel tank as some of you guys were saying you wanted more flight time. The 20 oz tank would require me to chop out too much of the former to be comfortable with however. This led me to buy a DuBro 16 oz and a Sullivan 16 oz fuel tank. I figured the 2 extra ounces would be better than nothing, I wouldn't have to worry about a cheap tank splitting, the actual fuel would sit lower which would avoid the flooding some guys were reporting, and the location of the outlets would assist m use of a fuel dot.
Imagine my surprise when I tried comparing the volume of the 16 oz tanks to the factory 14 oz tank and found them to be smaller. Initially I filled up the factory tank with water and poured it into the other two. When they both failed to hold the volume from the 14 oz tank I broke out the measuring cup. Turns out the H9 "14 oz" tank actually holds about 15 ozs. The Sullivan and DuBro "16 oz" tanks only held 14 ozs.
Was completely unexpected so I figured I would share in case it helps someone.