Sentences with phrase «excessively hilly terrain»

This mode is designed to sustain the battery's charge through excessively hilly terrain, but some owners have speculated that by using mountain mode for long cruises above 50 mph (the cap of the electric motor's optimum efficiency) and saving the 35 miles of battery power for the low - speed city segments at the beginning and end of a long trip, the driver can get closer to eking maximum efficiency out of the Volt.