According to this paper I’m going to consume even more energy as a cyclist than I would driving because I’ll live longer…

Key quote:

“That is, the energy savings due to the use of human power for transportation may be offset by the increased energy used by living longer due to better health. On first reflection, this is a bizarre Swiftian argument. However, I believe that the argument correctly places human-powered transportation, and physical activity generally, at the center of a basic societal tension between the quest for longevity and the environmental costs of increased population.”