Minimum Octane: (Ron + Mon) / 2 = 93

[DS997C2S]

I noticed that the minimum octane on my C2S is 93 based on (Ron + Mon) / 2 method. Most gas stations on my route have 91 octane only.

Do you know if any that have 93 octane?

King's Union 76 has 98 octane for $8.50/gallon and 104 octane for $9.40/gallon. They also have 100 octane and 110 octane.

975 Woodside Road

Redwood City, CA 94061

Phone:(650) 364-9620

What do you use? Any additives?

[JFP in PA]

Living in the former "Arnold-Stan", your fuel choices are limited by what the "authorities" allow the stations to sell, particularly in major metropolitan areas. That said, your DME is fully capable of dialing back the timing and fuel curves to deal with as low as 83 octane, but will obviously not produce maximum performance at that level.

At the other end of the spectrum, going nuts with overly expensive high octane racing fuel, or additives, will not buy you much additional HP either, as the DME can only crank up the curves so far, making the “high priced spread” a waste of money.

On 91 octane, you will not be giving up much compared to 93, so I would not be overly concerned about it.