Why automatic variant of Maruti Suzuki Celerio is showing low fuel economy as compared to manual?
By: Sharman on 18 june 2015
Hello Sharman !!
This is quite normal, the automatic variants of the car would always give lesser fuel efficiency as compared to the manual one. It is because they weigh more. And the torque converter is a fluid coupling that allows some slippage while the engine slows to lower RPM on an upshift or a higher RPM on a downshift. That slippage is inefficient, this is the main reason why the AT variants are lesser fuel efficient, and moreover the shifting program doesn’t have a knowledge of drivers intent.
Team Autoportal 2015-06-18
At present, it is a generally accepted fact that the automatic variants of a vehicle are supposed to give greater fuel economy as compared to their manual counterparts. However, in the past some researches on manual and automatic transmissions have found that manual transmission gives greater fuel economy if a car runs on LPG or CNG. Even, come vehicles with manual transmission are found to give more mileage and acceleration. However, this metrics varies from car to car and model to model. Nevertheless, some surveys also suggest that improvisations in the automatic cars and incorporation of greater number of gears as compared to what it was few years back has made them more fuel efficient. As Maruti Celerio belongs to this category of new age automatic cars having six speed gearbox, so there is no reason why it will give lesser mileage than the manual version. It is presumed there may be some internal malfunctioning of the gear system, clutches or something else that need servicing.
The fact that automatic transmission system reduces mileage sometimes seems absurd. In case of high end cars, the automatic transmission system increases fuel efficiency. It seems otherwise in this car. This is mainly due to the weight of the additional parts that need to be installed in order to avail this feature. The second reason is that the torque converter is fluid coupling. This allows slippage at lower and upper RPM. Whenever there is an up shift or a downshift, a little amount of slippage occurs which reduces fuel efficiency. These are probably the only known reasons for lesser fuel efficiency in this model.
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