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Time is money. How you value your time may be based on labor rates or some other alternative costs. The real analysis comes into play when comparing modes of transportation. Do I drive my car, ride a motorcycle, take public transportation, ride a bicycle, or walk? One retired executive doing many speaking engagements around the country found that a twin engine aircraft was the most economical form of travel given the value of his time. A streamlined bicycle is the most efficient energy wise but may not be fast enough for a trip more than 25 miles. A car pool of four people is more efficient than a motorcycle if trip time is the same. Buses are very efficient but not at all convenient most places. When possible I use a bus and take my bike on with me to solo commute.
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