2006 Lexus GS 300 Owners Manual - Page 384

STARTING AND DRIVING When the cruise control is being used, even if you downshift from "D" or "6" (sixth range) to "5" (fifth range), engine braking will not be enabled because the cruise control is not cancelled. For vehicle speed reduction, see page 394. Vehicles with the dynamic radar cruise control - When the cruise control is being used in the conventional (fixed speed) cruise control mode or in the vehicle−to−vehicle distance control mode, even if you downshift from "D" or "6" (sixth range) to "5" (fifth range), engine braking will not be enabled because the cruise control is not cancelled. For vehicle speed reduction, see pages 416 and 404. D Shift into the "4" (fourth range) position. The transmission will downshift to fourth gear when the vehicle speed is or becomes lower than the speed listed below and more powerful engine braking will be enabled. GS430 GS300 (2WD) GS300 (4WD) 193 km/h (120 mph) 187 km/h (116 mph) 178 km/h (111 mph) When the cruise control is being used, even if you downshift from "D" or "5" (fifth range) to "4" (fourth range), engine braking will not be enabled because the cruise control is not cancelled. For vehicle speed reduction, see page 394. Vehicles with the dynamic radar cruise control - When the cruise control is being used in the conventional (fixed speed) cruise control mode or in the vehicle−to−vehicle distance control mode, even if you downshift from "D" or "5" (fifth range) to "4" (fourth range), engine braking will not be enabled because the cruise control is not cancelled. For vehicle speed reduction, see pages 416 and 404. D Shift into the "3" (third range) position. The transmission will downshift to third gear when the vehicle speed is or becomes lower than the speed listed below and more powerful engine braking will be enabled. GS430 GS300 (2WD) GS300 (4WD) 144 km/h 135 km/h 129 km/h (90 mph) (84 mph) (80 mph) If you drive in the "D" position: Shift the selector lever to the "S" position and shift the lever down to the "-" position once to select "4" (fourth range). However, when you move the lever to the "S" position while the AI shifting control is operating, the first shift range will be "5" (fifth range), "4" (fourth range) or "3" (third range) because the suitable shift range is selected depending on the driving condition. If you drive in the "S" position: Shift the selector lever down to the "-" position to select the "4" (fourth range). If you drive in the "D" position: Shift the selector lever to the "S" position and shift the lever down to the "-" position twice to select the "3" (third range). However, when you move the lever to the "S" position while the AI shifting control is operating, the first shift range will be "5" (fifth range), "4" (fourth range) or "3" (third range) because the suitable shift range is selected depending on the driving condition. If you drive in the "S" position: Shift the selector lever down to the "-" position to select "3" (third range). 360