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I often hear debates over the costs of different modes of transportation, particularly between driving and public transit travel. Rising fuel prices have made public transit more attractive for some trips, boosting ridership, but critics point out that for most trips, transit fares are still comparable with fuel costs (for example, at $4 a gallon, fuel costs about $2 for a typical 10-mile trip, comparable to a bus fare in a typical city), and generally take longer. It is therefore legitimate to ask whether public transit really saves money.