There are obvious driving patterns that conserve battery power. I noticed when driving around town, where there is a lot of braking and accelerating the battery will deplete faster than when you are on the freeway. Another observation is that the battery us used less if you are going downhill. But if you are doing round trips like be back and forth to town, then going downhill one way will result in going uphill on the return trip. It evens out in the end. I did notice that if you could minimize rapid acceleration and braking, battery power is preserved. At the end of the day, the Volt used more battery miles from town to Pearl City and less from Pearl City to town. This due to the downhill effect going from Pearl City to town. Much of the car's battery performance is visible real time. The Chevy Volt has a power flow screen that is addictive to watch. It shows when the battery is feeding the transmission and when it is getting a regenerative buffer. Unlike the Toyota Prius, the Chevy Volt does not recharge the battery. Regenerative buffer is just a small charge flowing back into the battery. Day 4: Activating the gas generator.