I'm curious as well, I have an 04 PT 175, and it has a 20 gal tank with a 60 on the back. I seldom use the 60 much, a full tank of gas will last me all summer long (love that stabil) but usually just put 5-10gal in at a time. I do wish there was more room back there as the batteries are difficult to add water to (TM battery in particular) but the large tank is a plus if you are the type to run up and down the water all day long.