“The tires were almost half the prescribed pressure. Of course, it was already known on the drive. I finished them, but in a few days the pressure dropped again. So I drove for about a month, and still had to look for a pump where the air works. Only then did the valves change in my service and I was surprised how the consumption dropped by about two liters per hundred kilometers, “described the right minibus driver Jiří Pospíchal to Práva.
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Consumption is also affected by what tires the motorist buys. With a cheaper brand, they will save on purchases, but if they drive longer distances, they must expect higher consumption.
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The European Tire Classification System facilitates comparisons between tires in their fuel efficiency, wet grip and external noise. The customer can easily find his way around the labels, similar to those on refrigerators.
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Expel the devils
“Rolling resistance has a significant effect on fuel consumption. A properly inflated tire, which in the European tire classification system falls into class A, can save up to half a liter of fuel per hundred kilometers compared to the lowest performance tires, ”confirmed Matti Morri of Nokian Tires.
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For older diesel cars, clogged air intake can also significantly increase fuel consumption. Over time, the intake manifold becomes almost completely clogged with flue gas residues, especially when the driver travels shorter distances around the city. This is due to the EGR valve returning some of the exhaust gases back to the combustion chamber for re-combustion due to emissions.
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The valve releases more flue gases to burn through at a slower speed and with less power requirements, so they settle on the intake manifold, and after the gas is added, it closes and more new air enters the combustion chamber.
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That’s why diesel engineers advise motorists in cities to take them at least once an hour on the highway and, in popular parlance, “burn the devils.”
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Anyone who still drives the diesel engine only in the lower speed range to save, and does not turn the engine even once in a while, does not benefit the car.
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According to experts, engine braking also reduces fuel consumption. The so-called by shifting gears and commuting inertia to neutral, fuel is not spared so much. This is also shown by the current fuel consumption meter, if the vehicle is equipped with one.
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If the engine brakes, consumption also decreases to decimal and hundredths consumption. In addition, driving in neutral is not even safe. Of course, smooth and predictable driving also reduces consumption, not brake-accelerator driving style.
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