I just wanted to point out that Google maps will compare the cost of driving to the cost of public transportation, for trips short enough to have a public transport option.
For instance, driving from downtown San Francisco to the airport will cost $8.56 but public transit is $5.35. The site gives you the “IRS cost” of driving, so it doesn’t reflect regional gas prices or tolls. An example: http://maps.google.com/maps?f=d&saddr=94111&daddr=SFO&hl=en&geocode=&mra=cc&dirflg=r&sll=37.706505,-122.397575&sspn=0.338438,0.53833&ie=UTF8&z=11
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