Interesting. I have been told by relatively high level mechanics that higher octane is better, but that was for my tuned and high output modern engines. I instinctively applied that conclusion to my small engines, but after reading up just now I see that you are correct. I also read that stabilizers increased corrosion in the past, but apparantly Stabil does not. Thank you for drawing my attention to this!

Despite this info, I will probably still run 93 because I have it for my boat, and still store my small engines with trufuel because it is ethenol free. Thanks again.