I may decide to re-power my 19 foot Starcraft in 2011 and the lowest sustainable trolling speed an engine will do is extremely important to me. Please comment on your experience with newer outboard engines (any brand) in the 115 HP size. I currently have a 1992 115 HP 2 cycle Mariner which can go for hours at less than 2 MPH. I have a kicker but often prefer trolling with the main engine.