Hi, new to the forum. Just got my 2011 180 Challenger SE 215HP a few months ago. Was curious about my speedo reading as it seemed slower that it felt. This evening used GPS and assuming my GPS is accurate here is what my speedo said.....36MPH @7780rpm....GPS said......45.7MPH @7780rpm. On average throughout range speedo was off about 7-9MPH. I only have 5 hours on the boat so I could not push her at WOT for too long since I am still breaking the engine in. After break in, if the boat will push up to 8000rpm then I may get more speed. I am at full rpm now with almost a 1/4 throttle left to give but no extra rpm when I push to full, will this change after break in period? Does anyone else notice this? I guess I will find out at the magical 7-10 hours when the computer says it is ok to go wide open, LOL!