Times? During the summer more than 7. I always commute by bike (5-7 trips/week), plus there are groceries, church, going to friends' houses, etc. As rob_e mentioned, choosing to go by something other than bike doesn't have to mean a car. Hmm...I don't have a car, so does that mean that biking offsets 0 car trips a week, since I would be taking public transit if I didn't ride?

Edit: average commuting and errand mileage per week since Jan 1 is 55 miles