Franchise agreements. Franchisors and franchisees are required to comply with the Franchising Code of Conduct. The Code applies to conduct occurring on or after 1 January 2015 in relation to all franchise agreements entered into, transferred, renewed or extended on or after 1 October 1998.
Generally speaking, overdrive is the highest gear in the transmission. Overdrive allows the engine to operate at a lower RPM for a given road speed. This allows the vehicle to achieve better fuel efficiency, and often quieter operation on the highway.
Overdrive is the final gear in a car. the gear is used for gas efficiency and is usually weaker then the other gears and designed for highway cruising. You should leave it on unless you are towing somthing through the mountains, turning it off will lower your mpg. Most modern cars and turcks have an overdrive.