An inflation pressure that is too low leads to high rolling resistance on all tires. “The inflation pressure must be adjusted to the manufacturer's values when the tire is cold. “However, this positive effect only occurs if the prescribed tire pressure is maintained,” Koch reminds us. For a passenger car with an average consumption of 6.6 liters, this means a saving of up to 0.5 liters per 100 kilometers. With tires classified in class A for this criterion, a vehicle has a consumption advantage of up to 7.5 percent compared to class E tires. The fuel efficiency and rolling resistance category is all about the environment and consumption. Where one car with Class A tires is already stationary, the other is still traveling at 50 km/h – with a correspondingly higher accident risk. In the best tire rating (Class A), a passenger car achieves a braking distance that is up to 18 meters shorter than a vehicle with Class E tires in an emergency braking maneuver from 80 km/h. “The difference between class A and E tires can be as much as 30 percent in this respect,” Koch explains. With wet grip, the label sheds light on an important criterion for driving safety. The EU expects the label for car and truck tires to reduce CO2 emissions by around 10 million tons. Similar to the EU energy efficiency labels familiar from electrical appliances, the tire label, which has been updated in 2021, classifies the performance of tires on a scale from A to E, for example. Further pictograms provide information about suitability on snow and ice. Consumers can use it to better assess each tire in terms of safety, environmental aspects and consumption based on the three criteria of wet grip, rolling noise, and rolling resistance,” explains Christian Koch, tire expert at DEKRA. “The EU tire label is the only uniform and therefore comparable label for all tires.
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