I found this interesting. Sadly it had to come from this article in the Times.
— A cyclist can travel 1,037km (644 miles) on the energy equivalent of one litre of petrol
— Regular cycling can make you as fit as someone who is ten years younger
— A cyclist consumes 1/50th of the oxygen of a car making the same journey
— A twice daily half-hour commute will, over a year, consume the energy equivalent of 24lb of fat
— In 1949, 34 per cent of all mechanised journeys were made by bicycle. Fifty years later that figure had fallen to 2 per cent
— The rate of serious heart disease for civil servants who cycle 20 miles or more a week is 50 per cent lower than for their sedentary colleagues
Source: Somerset County Council