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Message: <blockquote data-quote="kosandpol" data-source="post: 8275687" data-attributes="member: 105851"> <ul> <li data-xf-list-type="ul">Brake (B)A mode selectable on some Toyota models. In non-hybrid cars, this  mode lets the engine do compression braking, also known as engine  braking, typically when encountering a steep downhill. Instead of  engaging the brakes, the engine in a non-hybrid car switches to a lower  gear and slows down the spinning tires. The engine holds the car back,  instead of the brakes slowing it down. For hybrid cars, this mode  converts the electric motor into a generator for the battery. It is not  the same as downshifting in a non-hybrid car, but it has the same effect  in slowing the car without using the brakes. GM called this HR (hill  retarder) and GR (grade retarder) in the 1950s.</li> </ul>S has 2 possibilities<ul> <li data-xf-list-type="ul">Second (2 or S)This mode limits the transmission to the first two gear ratios, or  locks the transmission in second gear on Ford, Kia, and Honda models.  This can be used to drive in adverse conditions such as <a href="http://en.wikipedia.org/wiki/Snow" target="_blank">snow</a>  and ice, as well as climbing or going down hills in the winter time.  Some vehicles will automatically shift up out of second gear in this  mode if a certain RPM range is reached in order to prevent engine  damage. Although traditionally considered second gear, there are other names used. <a href="http://en.wikipedia.org/wiki/Chrysler" target="_blank">Chrysler</a> models with a three-speed automatic since the late 1980s have called this gear 3 while using the traditional names for Drive and Low. </li> <li data-xf-list-type="ul">S or SportThis is commonly described as 'Sport mode'. It operates in an  identical manner as 'D' mode, except that the upshifts change much  higher up the engine's rev range. This has the effect on maximising all  the available engine output, and therefore enhances the performance of  the vehicle, particularly during acceleration. This mode will also  downchange much higher up the rev range compared to 'D' mode, maximising  the effects of <a href="http://en.wikipedia.org/wiki/Engine_braking" target="_blank">engine braking</a>.  This mode will have a detrimental effect on fuel economy. Hyundai has a  Norm/Power switch next to the gearshift for this purpose on the  Tiburon. GM also used S to indicate a "super" mode, being the same as the 2  position on a Chrysler, shifting between only first and second gears.</li> </ul>Dont use B or S for general driving as both are very low on fuel efficiency.Source : <a href="http://en.wikipedia.org/wiki/Automatic_transmission" target="_blank">http://en.wikipedia.org/wiki/Automatic_transmission</a></blockquote>

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