Simplify the following text for a Grade 6 native English-speaking person.
Original: Most fuel stations have two storage tanks ( even those offering 3 or 4 octane levels ) , and you are given a mixture of the higher and lower octane fuel for the intermediate grades . Premium is fuel from the higher octane tank , and the minimum grade sold is fuel from the lower octane tank .
Simplified: Such fuel has a higher octane rating .