Due to inconsistent weather, I decided to use my trainer today. I also decided to push myself for extra distance since if I couldn't finish, I wouldn't have to worry about not making it back to my house or car depending. I did 75 miles today on the trainer at 3 hrs 52 minutes. 18+ MPH. I've only done 2 metrics prior to this. THe thing I noticed was I was starting to feel my legs get worn out faster than when I ride outside. That of course is with little to no wind on average. Do any of you find it the same way, opposite, or a draw between the 2? Could it be that the roller was pressed up to hard to the rear wheel and is causing added resistance. By the way, I have my computer attached at the rear wheel so I could figure out distance and speed when using my trainer.