Hands down, outdoors. That is where I do most of my business anyway.
One thing that bothers me though is seeing a full bottle that someone has thrown out. You did your business in your car, keep it there until you can dispose of it properly.
Mercer Boy wrote:My dad does that outside everywhere...and I mean EVERYWHERE. I only do it when I absolutely have to...otherwise indoors is fine.
I had a neighbor that was like this. We'd all be sitting around his porch or something and he'd casually walk around between his bushes and his house and just go, still talking. I didn't know what he was doing the first time and asked him if he was looking for something in the bushes. Everybody laughed at me then.