Premium gas in the US typically has a higher octane rating, ranging from 91 to 94 depending on the brand.

Keep that in mind the next time you fill up. As a luxury brand, it stands to reason Infiniti vehicles would need premium fuel. And for the most part this is true. Their muscular, high-compression ...

There’s premium gasoline, mid-grade, regular and – depending on where you live – some even offer ultra-high octane, with a rating of 94 or above. Octane numbers, ethanol content and diesel ...