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Unfortunately, I searched for Sunoco locations that have 100 octane gas available at the pump and the closest such station is approximately 30 miles from my home address. This leaves me with trying Union 76 premium pump gas locally or continuing to add octane booster to Shell premium pump gas. Since I use my car on a regular basis, driving to a Sunoco location that has 100 octane pump gas when my fuel level drops below 1/2 of a tank does not appear to be a practical solution.
By the way, the octane booster that I currently use is marketed by Royal Purple and it appears to be sufficient to avoid pinging when mixed with 91 octane pump gas with my ignition timing set for maximum performance.
I looked into the Octane Supreme product and found that the primary active ingredient to raise the octane number was tetraethyl lead. Because I use a wideband O2 sensor for tuning, I would prefer to stay away from this product which could contaminate the sensor.
John
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