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With less than 5 mile trips you will be hard pressed to get good milage. For your driving technique, if you aren't already work on letting the car coast as much as possible before coming to a stop. You don't want to power the engine right up to a stop. With some practice you will learn when to put it in neutral or let out on the gas. Learn to take turns "a little fast" (but still safely) when you don't have to stop to keep up your momentum. As far as mods go you should consider an engine heater if you park in a place that you would have access to power like a garage. Most engines add extra fuel until the engine heats up, so even when you are coasting in neutral a cold engine will use more fuel than a warm one. I experience this every day on my commute.
If you don't put a lot of miles on your car you should be changing the oil based on time, or a reduced milage figure. Warmed up highway miles are a lot easier on a car than cold city miles.
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