The CA has other features which include total miles traveled so even if you travel under 20 miles it's a good idea to use the CA. This will allow you to keep track of how many total miles you've gone using that particular motor or you can move the CA with the battery and keep track of the mileage for that particular battery/batteries.
EDIT: That's total miles of the life of the motor/battery and not just the individual trips. It's like the odometer of a car.
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Last edited by EBikeFL; 05-24-13 at 06:21 PM.
Reason: clarification