Very interesting replies, please keep them coming. Ebijack - I plan on running the nothing but the Mercury Premium Plus 2 stoke oil. I've already heard from Mercury mechanics that this will help with the smoking that these engines are notorious for. Additionally, when I took the boat out on sea trial, I was able to get my speed down to 2.5 mph running just one engine. Please bear in mind, that was without any assistance from trolling bags. If I were to decide to troll with one of the big engines, I would also use two bags - one on each side. Theoretically, this should allow me to run the engine at a slightly higher rpm while maintaining speeds close to 1 mph. I've also read that running the engine at a slightly higher rpm will produce a cleaner burn and less likelihood of carbon buildup.