That may be true, as long as people don't live much further away from work.
But that is a choice people make and within their control. I have moved more than once because of where I was working.
Yeah, but wherever they live (which is a choice), and whatever mileage they get (which is also a choice), when I drive into the city to go to work, there are thousands and thousands of cars all around me with exactly one occupant per car. That has to say something about the price and economic value of gasoline.