Bela P. Havasreti wrote:


Around here the grades on the pump are 83,89 and 93. Here=South & Central
Arkansas.

I think he's mistaken on the 83.



I've always wondered why the mogas octane levels are different around
various areas of the US. Where I live (northwest), our mogas is
87, 89 and 92.

The lowest octane that you find in a given area has to do with altitude.
The higher you are the less octane you need. Around here regular is 85.5