Driving about 25,000 miles a year adds up! Figuring that my wife and I each drive about 30-40 miles a day simply commuting, our daily commute costs us between 8 and 12 dollars. At what point do we reach the Tipping Point where public transportation is a more efficient option than driving?

If gas prices stay at or near this level, does somebody out there have the time and knowledge to do some back-of-the-envelope math?
Wow. $2.40/gallon for Plus. I need to get a Hybrid. Driving about 25,000 miles a year adds up! Figuring that my wife and I each drive about 30-40 miles a day simply commuting, our daily commute costs us between 8 and 12 dollars. At what point do we reach the Tipping Point where public transportation is a more efficient option than driving?

If gas prices stay at or near this level, does somebody out there have the time and knowledge to do some back-of-the-envelope math?