I agree, but there are more costs associated with commuting than just fuel, namely the car itself, maintenance, and insurance.
Yeah, and you pay for all that crap whether you drive-commute or not. Maintenance costs are lower if you drive less, but you still pay insurance, tabs, and car payments until you own. That makes bussing/using public transit less attractive - esp. when the cost is close to the cost of driving.
just to be clear, I was referring to the cost of a second car that is used by the commuting partner. For us no commute = no second car = no second car costs.