Everybody wants to know the ways they can save probably the most gas. Although you will find products around that will allegedly help with this, a lot of that is not accurate. Hypermiling is one thing that is scientific. Popular Mechanics reports that coasting in neutral won’t do anything close to what effective hypermiling is going to do for you. It is also very dangerous to do.
Coasting in neutral disables the accelerator
When coasting and seeing road hazards, accelerating to keep away from isn’t an option. It is also nearly difficult to get around sharp corners when in neutral. The engine and drive train are not connected anymore.
A gas saver?
It doesn’t make any sense that gas could be saved when in neutral. Each and every hour you leave your car running, one gallon of gas is used in it. Considering that, going down a hill that is a mile long at 30 mph will be about .033 gallons used.
But the engine is still producing rpm
From idle to full throttle, an oscilloscope shows the pulse-width-modulated wave signal to be between 5 and 8 percent. The higher the percentage, the higher the rpm goes, and more fuel is consumed. Ultimately, once the car reaches the bottom of a hill – or as a car creeps up to a traffic light – the engine eventually slows to an idle rpm, about 1,000 rpm. Of course your automobile may be a little different. At that point, the car’s fuel injection starts adding fuel to keep the engine from stalling out. The driver feels this as a slight rev up, and also the oscilloscope shows that pulse increase. As outlined by Popular Mechanics, this shows that really, gas is just being used when it doesn’t need to be.
Trip computer
The trip computer sees something weird when a car coasts in neutral. Increased mileage which is a “false positive” is shown to your computer. That’s why gallons into the tank divided by odometer mileage (and checked against a handheld GPS device) are more useful when analyzing fuel economy. Sitting in neutral is worse than simply turning off your vehicle at a red light reports Popular Mechanics.
Further reading
Popular Mechanics
popularmechanics.com/cars/how-to/repair/coasting-in-neutral-fuel-economy
A “gravity hill” in Chenju, South Korea
youtube.com/watch?v=yBXjwnc51Pc
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