Yeah, the cirrus has the OPTION of carrying 25 gallons more fuel than the stock A36 if I believe. The old rubric goes if you can fill the seats and the tanks at the same time the tanks are not large enough.
In my Navion I have four tanks (actually five) and I can fill some and carry four, or I can fill them all and carry two.
In my Navion I have four tanks (actually five) and I can fill some and carry four, or I can fill them all and carry two.