Engine block heater
Full grill block that can be partially or completely opened by the driver as they are driving
Engine blanket/insulation around the engine compartment (make it easily removable for when you need to make a long trip).
Since you have a short, stop and go, low speed commute, anything you can do to reduce weight, decrease rolling resistance, and reduce the time it takes for your engine to heat up to normal operating temps will help. Aerodynamic improvements will help but are less dominant at those speeds.
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