Hi Rob -
The Smarts can get decent MPG when driven carefully.
I'd guess that option 1 would return your highest MPG, owing to less stop & go. But the question of whether it consumes the least fuel overall compared to #2 or #3 is another question (longer trip length).
Have you considered getting an OBD gauge (ScanGauge, UltraGauge, etc) that will give you real time mileage feedback? That way you could answer your question through trial and error, PLUS you would have an instrument that helps you fine-tune your driving all the time. Turn your commute into a fun game.
Welcome to the forum!
Darin
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