I commute in two ways with the bicycle. My commute is 14 miles each way in the Appalachian mountains so I do it about twice a week when I can, sometimes once, and somtimes none .
But I keep a Walmart Schwinn Avenue locked to the a bike rack at work because we have about 6 other offices in town I routinely visit. So even when I have to bring my car (due to bike tires cut up, broken spokes, etc..until its gets repairs or other reasons) if I need to go out locally I just use the Schwinn. I leave it 24/7 here on a bike rack. It's a 24 hour service and we have our own security team. If something happens to it, I got an old Walmart 7 speed Avalon I'll put over there and lock up.