Most of the Coastie Hurks were E and H models. I know some of them had aux tanks in the fuselage that held even more gas.
After 10-12 hours at a sitting in them I am glad we are out of gas and have to stop. The noise and beating of the props just kills you.
Hard to believe they have been making them since 1956. And they are still rolling off the lines in Marietta Georgia.