Difference between 87 octane and 91 octane?

I love this question

Octane rating indicates the ability of the fuel to resist ping or Knock inside the combustion chamber. This can be very damaging, especially on older performance cars.

Not to many years ago regular fuel was 91 octane and premium was 98

Pretty neat how they lowered the quality of the fuel and charged us more?

What you need to know:If your car calls for 87 octane regular fuel there is no benefit of running mid grade or premium.

If your car calls for 98 octane or better in the USA there are a few stations that sell it ( I know one in east Las Vegas )or you will have to visit your race fuel sales depot regularly like I do.