Just curious as to what kind of gph I can estimate running my (actually my dad's-he's giving it to me) 13.5' Zodiac up the Little Su with two guys, fishing & overnight camping gear with a 15hp 2 stroke long shaft? Will I have issues running a long shaft up the river from the landing? I've run the 15hp (late '80s Johnson) a lot (on a flatbottom jon boat) in the Big Lake area but never calculated gph as fuel wasn't an issue. I assume I won't need nearly as much gas coming down!
On another note, any idea what kind of gph a 20 hp 4 stroke will get compared to the 15 hp 2 stroke? I'd like to get a 20+/- hp 4 stroke eventually so I don't have to borrow my dad's 15hp Johnson, just don't know if I can do it this year.