I rode my bicycle to and from the Rosedale park-and-ride (about three miles each way) both Monday and Tuesday. From there I took an express bus to work in downtown Minneapolis as I usually do. I gave my knees a break yesterday and drove to Rosedale, but I was back on the bike this morning. I hope to manage 3-4 carless commutes each week through the summer and early fall.
Long ago I read an article arguing that per passenger mile the bicycle was the most energy-efficient form of transportation known, not only to homo sapiens, but throughout the animal kingdom. It was in a reputable scientific publication, Physics Today IIRC, with plenty of numbers, equations, and graphs. I wonder if I could track down a copy of it.