Yes, and here's why: • 4WD consumes a lot more gas since the vehicle is sending power to two more wheels. If you don't need it then it's better to just switch it off.  • You might break the differentials and front axles. Part-time four-wheel-drive systems are built for rough roads and surfaces where traction is low. If you overuse 4WD on roads that aren't slippery, you might end up damaging the axle, U-joints, bearings, and other drivetrain parts. Find out more in this article .