What might the relative rate of fuel consumption be between a Yamaha 50, a 115, and a 150, given the same type of usage over a season? Usage would likely be mostly cruising and fishing, so a lot of fairly slow moving. My current set up is a Yamaha 50 but I'm looking to order a whole new outfit and just wondering about tradeoffs in going BIG. Mainly it's coming down to either a 115 or 150. If I went with the GFS model with SPS package and a Yamaha 150 SLO, how might that negatively impact how I currently use my rig (that is, slow cruising with a couple of other passengers, and fishing). It would be over-kill, I realize... but might there also actually be negative implications?