Originally Posted by Rain Man
The treadmill question is compelling.
Full disclosure... I count my treadmill miles. That's not a big deal because I probably have less than 5 a month. And I typically set the incline at 1.1 or so to account for the easiness.
But I also count my bike trainer miles. I have a ton of those. But riding on a bike trainer might be tougher than riding outside. No coasting on the trainer. No wind resistance, either, though.