I asked my accountant last year if I can report money that I made selling miles and he said I can't.
Can't, or shouldn't?
The only reason I would imagine he would say you shouldn't (and possibly the reason that you wanted to count it) was if you were trying to increase your income to get the Earned Income Credit where you wanted it. In that case selling miles wouldn't count as income for the EIC unless it was a business, not just a small thing that you do here and there.
Other than that I don't see why he would say you 'can't' report it.
Now figuring out your basis to determine the amount of income is a whole different animal...