Only by necessity. If I'm working away and have to leave a hotel earlier than the restaurant opens I might use a drive through for breakfast. Generally I don't like food in my car - probably harks from the days of small children stuffing unwanted bits af sandwich under seats and in various compartments. 'Snacking' I don't relate to, even on long journeys.
Most hotels here anymore don't have restaurants. They all offer "free breakfast." That means thawed out danish and muffins, and maybe some bacon and scrambled eggs.
But, I manage to eat it before I go to the airport, where the same breakfast will cost me 15-bucks. A good breakfast will cost me 30-bucks. Airport food is a money muncher.
Then there is NY LaGuardia airport, where the food costs too much, and could possibly kill you.
CD