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First voyage out the battery lasted 11.1 miles with pedaling. The kill-a-watt says the charger and battery took .35KWH according to my math that is 31.5 watts per mile.
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Razor,
I have a few thoughts and questions that may help.
First off, what speed are you riding at or attempting to average?
Over 20 mph will suck the batteries down fast. I had a purposely small pack(150WH) and used to cruise at around 18mph. That was good for 5 miles with no pedalling. If I rode in the upper 20's I would only get about a mile and a quarter.
With about 50/50 pedalling I easily travelled 11 to 12 miles on a full charge.
When accelerating from a stop, always use pedal only either until you reach the speed you want or just can't go any faster on your own power, then start using the motor. Just like in a car it takes a lot more energy to get that mass up to speed than to maintain the speed.
Put a wheel cover on the rear wheel for better aero.
Consider a small front fairing that you could crouch behind. Again, better aero.
Hope this helps.
JJ