I don't eat subs while driving. They fall apart. But a Maccas double cheeseburger, the sticky "cheese" holds the burger together. I say "cheese" because it could be cheese, or some kind of thermoset plastic if Maccas can get away with it. In any event, it's a good road burger. Other than that, I would probably only eat Combos whilst driving. Crackers / pretzel tends to settle a stomach.
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View my fuel log 2020 Mirage ES 1.2 manual: 42.5 mpg (US) ... 18.1 km/L ... 5.5 L/100 km ... 51.0 mpg (Imp)