[kaisen]

You'll start seeing "hybrids" that go after the low-hanging fruit of stop/start, regenerative braking, and electric motor assist where they can use smaller primary gas motor, and benefit from the instant torque of electric motors to get moving from a standstill. This "mild-hybrid" formula uses a relatively small battery pack so it skips the expense and isn't constrained so much by current battery capacity limitations. It really does make a big difference in overall fuel economy.