Why was an Ultimate-fuelling calculated on my invoice?

Please do not refuel with so-called "Ultimate" fuels! These types of fuel are considerably more expensive than the standard types. Tests have shown, however, that possible advantages of these new types do not justify the high price. If you do refuel with an "Ultimate" fuel, we will charge you a surcharge of 10 cents per litre, but at least 5 euros. We ask for your understanding.