In the U.S., regular unleaded gasoline usually has an octane rating of 87, with some pumps at higher altitudes also ...

Pulling up to a bank of gasoline-only pumps presents you with another set of choices. Most service stations offer at least three grades of gasoline with different octane ratings, ranging from the ...

Gas with a higher octane can withstand a higher compression ... Premium comes with an additional cost at the pump, usually ...