I can't quite get my head round what you are picturing Raggytash.
Do you picture moving one bicycle plus one person(~80kg?) five miles creates only slightly less CO2 than moving one car plus one person(~800kg?) five miles?
I'm picturing it as burning about four digestive biscuits(200kcal) v 0.3 litres of petrol(3,000kcal)
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sj