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The total average cost of driving, including depreciation, maintenance, and insurance, runs about 61 cents a mile, and since the average automobile used for commuting to work contains only 1.1 people, every commute costs a little more than 55 cents per passenger mile. This means that, if you’re an automobile commuter traveling twenty-five miles each way to work, you’re spending around $30 a day for the privilege, not including the cost, if there is one, to park. You’re also spending an hour every day for which, unless you’re a cabbie or bus driver yourself, you’re not getting paid, and during which you’re not doing anything productive at all. For the average American, that’s another $24. In transportation, time really is money.
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Samuel I. Schwartz (Street Smart: The Rise of Cities and the Fall of Cars)