It also helps as to how far you can go on a charge, as to what speed you have the scooter in. Which means the faster (rabbit speed) you have the scooter set at and run at, the greater drain on the battery.
From my experience there with the crowds, there really is no reason to be in any faster speed than say mid range ever. Most of the time I was in the slowest speed range and would only turn it up slightly to help it get on the bus ramps then turn it back down. You'll have to guage your speed by the crowds and your traveling partners anyhow.