Good question, FletcherNelson. This depends greatly on how often you use public transportation, and what your commute is. The average distance of commute in the US is 16 miles. There and back is 32, and if you work 5 days a week, this brings us to 160 miles a week. The average miles per gallon of cars in the US is about 20, so that is 8 gallons total for the week. Since 1 gallon of gas is equal to 130 million joules, that means you are saving about 1 billion joules, or about 289 kilowatt hours.
Hope this helps!
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