I'm not saying trainer miles are evil. They are good exercise machines, like a Stairmaster. But going out for a jog is more similar to road cycling than working on a trainer inside. Can I add running miles to my total without saying what I'm doing? Afterall, running is good exercise too?

As far as reporting miles, don't be silly. Most people who use these forums are smart enough to figure out what details are important and what are not. You can paint with a very broad brush, but it is helpful to give some idea about the conditions of your rides.

No one has rebutted this argument: You should list trainer miles separately from road/trail miles because some people using this forum see a difference. When you write "I rode 5K miles," many will assume that means road miles. Since you are honest people, I assume you will not want to deceive other forum users. Just separate out the trainer miles. Those of you who don't care can look at the total. Those who care can look at the road miles.