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This is a tough one.
First: other than the odo/speedo, is the car is otherwise in good tune, with tires properly inflated?
Driving without brakes (DWB) and engine off coasting would dramatically improve fuel economy, but (1) I don't know if it's mechanically safe for your particular automatic transmission; and, (2) how much extra time are you willing to spend on your route?
DWB (with or without EOC) will significantly increase the amount of time spent on the road in a mailbox-to-mailbox delivery scenario.
As for mods, off the top of my head, aggressive weight reduction would help in your situation.
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