1999 Mercury Sable Owner Guide 1st Printing - Page 108

Driving N (Neutral) With the gearshift in the N (Neutral) position, the vehicle can be started and is free to roll. Hold the brake pedal down while in this position. P R N D D 1 (Overdrive) The (Overdrive) P R N D D 1 position is the normal driving position for an automatic overdrive transaxle. It works the same way as D (Drive) but shifts to a fourth gear - an overdrive gear - when your vehicle cruises at a constant speed for any length of time. This fourth gear will increase your fuel economy when you travel at cruising speeds. Overdrive may not be appropriate for certain terrains. If the transaxle shifts back and forth between third and fourth gears while you are driving hilly roads or if your vehicle requires additional power for climbing hills, shift into D (Drive). 108