* Improved fuel economy: Lower engine RPMs at highway speeds mean less fuel consumption.
* Quieter operation: Lower engine RPMs result in less engine noise.
* Reduced engine wear: Less stress on engine components at cruising speeds.
On older Mustangs, overdrive might have been an optional feature, often found in the transmission itself (e.g., a specific type of automatic transmission). On newer Mustangs, overdrive is a standard feature of the automatic transmission. It usually engages automatically, but some models might allow for manual selection (e.g., via a button or gear selector). Sometimes a driver may want to disengage overdrive for situations needing more engine braking (like downhill driving or towing).
