2008 Mercury Sable Owner's Manual - Page 235

Driving D (Drive) with Overdrive The normal driving position for the best fuel economy. Transaxle operates in gears one through six. D (Drive) with Overdrive Cancel and Grade Assist Pressing the transmission control switch on the side of the gearshift lever activates two features at the same time: Overdrive Cancel and Grade Assist. 1 Overdrive Cancel Overdrive is deactivated. The transaxle operates in gears one through five. The O/D OFF lamp in the instrument cluster is illuminated. O/D OFF 2. Grade Assist • Improves driving experience in hilly terrain or mountainous areas by providing additional grade (engine) braking and extends lower gear operation on uphill climbs. • Provides additional engine braking through the automatic transmission shift strategy which reacts to vehicle inputs (vehicle acceleration, accelerator pedal, brake pedal and vehicle speed). • Allows the transmission to select gears that will provide the desired engine braking based on the vehicle inputs mentioned above. This will increase engine RPM during engine braking. Overdrive Cancel with Grade Assist is designed to provide optimal gear selection in hilly terrain or mountainous areas. It is recommended that you return to O/D (overdrive mode) on flat terrain to provide the best fuel economy and transmission function. 235 2008 Sable (mgo) Owners Guide (post-2002-fmt) USA (fus)