I got into a discussion with a non-cyclist on a bus recently. I alleged that a cyclist crossing the country would only use the equivalent of 1.5 gallons of gas while a motorist would take 200 gallons or more. He countered with "How much fuel would be needed to produce and deliver the 3 weeks to three months of food you would be using? A car can cross in a week or less." Good point. A buddy and I crossed coast to coast in 50 hours in a van with a bed in it. Has anyone worked out the total energy costs of cycling, not just the energy loss in wind and rolling resistance?