Cruise control can help your car stretch a tank of gas, but the button doesn’t come with a money-saving guarantee. On a flat highway, it can reduce unnecessary acceleration and help improve fuel economy. On rolling hills, however, your car may burn extra fuel trying to maintain the exact speed you selected.
Speed itself also plays a surprisingly large role. A driver can activate cruise control, settle comfortably into the driver’s seat, and still waste gas by traveling faster than necessary. The system follows your instructions, not your budget.
