Now that I think about it, it was colder than usual. Plus the fact that I decreased tires' pressure to those specified by manufacturer.
By the way... Maybe this doesn't have anything to do but... My father filled up the oil tank 2 cm above the maximum level. May that affect fuel economy? If there's too much oil, that oil may get sticked to a plug and more fuel would be needed to maintain the engine working. Maybe THAT is the issue! Am I wrong?
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