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Where are you in Canada? I've only seen one CitiCar/ComutaCar before - maybe 20 years ago in Ottawa.
I'm not sure about gel cells, but the rule of thumb I follow for flooded lead acid batteries is you should never draw any individual battery down below 1.75 volts per cell (5.25 volts per 6 volt battery, or 10.5 volts per 12v battery).
Below that voltage you risk permanent battery damage (chance of cell reversal).
When voltage can't be held above this value under load (regular use), the battery is effectively at 100% depth of discharge. So you can estimate your range based on this info.
Ryland is right though: a battery pack monitor is best.
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