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Coasting with car


ravi688
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I basically feel that coasting the car is never a good idea especially during down hills. People usually think that, coasting the car might save fuel for them but, they hardly notice the major disadvantage in terms of safety issues during this process.

 

Yes, it does save some fuel but by putting your vehicle in the neutral mode which is quite dangerous.

 

For instance, While driving downhill (in neutral mode) modern transmissions cut off the fuel supply to the engine so you will basically use the wheels. Whereas the engine which is still in gear, shuts off the fuel injectors. This prevents engine braking and thereby resulting in free wheeling and picking up speed.

 

Mainly it results in less control for the driver. So, always please coast downhill in a lower gear and keep your left foot off the clutch pedal as much as possible.

 

This difference in shutting off fuel indicators can be observed in the fuel economy indicators, in neutral it will read a little bit low and then if you put it on drive the instantaneous fuel economy indicators will go up to do the highest possible number it can reach due to the fuel shut off from going into the engine.

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clutch-description-diagram.jpg

 

Coasting vs Engine braking

 

Coasting :(Engine A)

No connection between the engine and wheels.

No engine braking.

Excess wear and tear.

Dangerous, not recommend.

 

Engine braking (Engine B)

Connection between engine and wheels.

Engine braking helps in controlling the car.

Less wear and tear.

Correct way to drive.

 

Coasting may give a little mileage advantage, but it is not worth the risk.

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Definitely NO for coasting. In the name of saving fuel, will end up damaging the clutch and sometimes Gears as well. In slopes, if you are at good speed during coasting, when you engage the clutch it's instant high preasure will damage the pressure plate and end up in lock which will seize the engine from cranking.

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