What is the difference between A1 Standard and B1 Standard?

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A1 Standard-compliant fuels are considered to offer superior quality compared to B1 Standard-compliant fuels, due to the fact that the A1 Standard establishes stricter requirements in terms of sulfur content and other aspects. However, it is important to bear in mind that the quality of fuels can also depend on other factors, such as the type of vehicle and usage conditions.