Allow me to be the first in this thread to point out that you will not go infinity miles on one gallon of gasoline on a bicycle, you will probably just keel over and die because you just drank a gallon of gasoline.
Furthermore, if you consider the amount of petroleum used in the manufacturing of a bicycle, the distance most food has to travel before it reaches or plates, and the amount of petroleum-based pesticides and fertilizers used in modern industrial farming, each of us does "consume" a certain amount of "petrol" per calorie, and, therefore, we do "burn" a certain amount of fuel for each mile ridden on a bicycle.