This kind of mathematical formula is very difficult to standardize. I'll use myself as an example. I am currently seeing some monthly savings by using my bike more than my car, but this is because:
-I drive a WRX...that thing get's 20 MPG on average, on premium gas.
-since I've started commuting to work (downtown), I've been able to save money by not having to buy the monthly pass for the train.
-Parking on the street, for a motorcycle, is free in Toronto.
So far I've managed to see a gas savings of $30 for the month of June, and also saw an additional savings of $60 from not buying that pesky monthly train pass. The real catalyst to these savings is that the parking is free. If this was not the case i'm pretty sure I wouldn't be saving anything.
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