Perhaps, though I don't know where that number comes from. If it's purely gas mileage, then it doesn't account for cost of insurance, cost of the car, risk of an accident, cost of storing the car, cost of general maintenance, and, while sort of ancillary, cost the urban area if everyone relies on driving. If it's not pure gas mileage, I'd be curious how that formula works out, but there remain problems with that as a solution to anything.