I think it's almost impossible to estimate the savings. How much does heart disease and being overweight from allowing yourself to waste away in a car cost you in the long run? Loss of income due to more illness/shortened working life? Lack of energy? General well-being? Being fat and inattractive vs fit and attractive? About being outside feeling the wind in your face and interacting directly with reality rather than sitting in a box observing it through a window? (I'm sure that's not good for a human mind, IMO over time it makes you fat, lazy and stupid!) Impossible to put a price tag on. And honestly, even if I didn't save anything monetarily over driving a car I'd still be on a bicycle or mc.