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It's just one guy and his vehicle. And as far as vehicle users go he's doing OK (transporting high volumes of people and whatnot). The problem expands way waaaay beyond individual car users and encompasses all of American society. He can't just be expected to do everything all stubbornly and consume his time and energy just to save a bit of gas. Sheesh.
He would, however, do the environment a favor, and still have to alter his lifestyle very little, if he went back to being a vegetarian. The global meat industry pollutes the environment way more than all the planet's car, trains, boats, and planes put together.