Cycling uses less energy than driving - maybe.

According to Bicycle Universe [as reported by World Watch], the energy efficiency of a one-mile urban trip in a 2003 Honda Civic is 32 mpg (13.6 km per litre). The energy efficiency of a one-mile urban trip by bicycle, when the cyclist is fueled by meat (which contains the embodied energy required to produce and transport one mile's worth of meat energy to the cyclist's home), is 31 mpg (13.2 km per litre). But... the energy efficiency of a one-mile urban trip by bicycle when the cyclist is fueled by bread is 300 mpg (134.2 km per litre).