Bernica,
I searched for 76 and other brand stations that have 100 octane pump gas and unfortunately there were none sufficiently close to my home to make blending of 91 octane and 100 octane gas a practical long term solution. For the time being, I will stick with an octane booster additive mixed with 91 octane pump gas since I can always carry the octane booster with me.
I guess the next order of business for me would be to determine which brand of octane booster is the most effective one to use. I would be interested to know if anyone on this forum has useful information regarding the relative performance of the various snake
oil formulations that are available on the market. It is hard to compare these product by reading the labels on the bottles or from their advertising material.
John