Yeah, I always use a credit card. The difference between throwing change away and putting it in a jar is that one is a mindless reaction to going through my pockets and somehow coming up with a nickel, and the other is something I would actually have to remember to do once I got home.

Also, when I say I "throw it away", I mean that in most cases, I just literally toss it on the ground. Society doesn't consider it litter, so what the hey...