Interesting (to me anyway), the top speed of a trolling motor is 5 mph.
I'm starting to think SM knows more and is stating his fabrication of events with bits of truth mixed in. I see no reason he would say that he left the house and went back to the same location across the bridge going 4.2 mph in 2 to 3 hrs. He knows that doesn't add up to 17 miles. He said that on a nationally broadcast show that he had much time to prepare. But you could go to the same location in 2 to 3 hrs if you weren't on the road. He never said he took the same route just back to the same location. I'm finding it interesting to listen again for things he isn't saying that I have just inserted or assumed but isn't actually stated.
Also he never said he went to that former property, just that he crossed the bridge. In looking on maps, there is a marina across the bridge. And lots of lake homes with boat docks.
Just not sure why they would go to such lengths to dispose of his phone. There are better ways. So maybe his phone wasn't being disposed of. A murder weapon, someone would go to lengths to get rid of that. Maybe they didn't realize the speed could be determined and they brought it along to create evidence of suicide, browser history, etc. Obviously I'm not sure of the course of events but I do think a boat was involved, not a bike.