I’ll second what the others said: you should not need any additional fuel for a 20 mile ride under normal circumstances. But we don’t know the details of your eating habits and physiology, so... What I’d recommend is to use Strava or a power meter to estimate the caloric expenditure for the ride. Anything below 700 (dietary) calories, and the muscles should have that amount in glycogen. But if you had only a coffee for breakfast and your first substantial meal of the day is dinner, and the 20 mile commute home includes Strawberry Canyon, well then you probably need to eat a bit beforehand.
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