How I answer cost / savings question: When people find out I often ride my bicycle to work they always get around to asking me about the cost or savings of riding my bicycle. I have an electric assist bicycle. (only assist’s me, I still need to peddle) It most always feels like they are looking a number that way it will help them feel more justified driving their car. Questions are always: “How much I think I am saving by riding my bicycle?” Or. “How much is the bike costing me per mile?” I check my bicycles odometer for mileage and give the same answer to either question. “I don’t have an exact dollar per mile number, but I can tell you it has NOT cost me XXXX miles in my car. And I need the exercise anyway.” The response in most always, “GOOD point!” and sometimes they add “I should look into something like that or some other way to not drive.” I used to try and give them a dollar amount. That mount was never substantial enough to make an impression. (I don’t have a good way to figure a dollar amount anyway) When the amount is given in miles not spent in the car it makes a MUCH bigger impression then a dollar amount.