People using old second hand cars in cities, particularly novice drivers engage irrelevant
gears; this in turn leads to fuel wastage and importing more petrol and diesel. One simple solution is
to educate and alert the drivers. In the current paper we explain how to design a low cost, add-on
type of s assembly unit which can be fitted on any existing vehicle. This assembly unit along with
the necessary signal conditioning circuit with implemented on a microcontroller. By listening to this
alarm, the drivers can engage proper gear to enhance the fuel efficiency. By linking the speed and
load information available with the engine management system, with the proposed system, one can
even educate and guide a driver to use correct gears.
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