My personal H3 review and experience

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Nice write-up.
Now, going up in octane should show no results. Cars requiring high octane and dropping down to a lower octane will lose power. The knock sensor will signal the computer there is knock and the computer will change timing, reducing power, but removing the knock.
Cars requiring regular have no sensors to help the computer advance the timing. You may get a little, since the computer will always advance the max, then back down. Questionable, with pure gasoline. Some reports I have recently read by MPG, state in areas using ethanol, there might be a slight increase by going up a bit. Not sure if it is worth the dime difference though.
Synthetic oil is not really required. I use it only because I have about five gallons stored from my Vettes, and I got a hell of a sale (1/2 price on Mobile 1).
The syn/dyno mix is totally worthless since the dyno oil nixes any good the syn oil offers. That is a fact based on a lot of testing, and can be found on the internet, as well as test results from Ford, GM and the rest of the manufacturers.
One other thing with syn. Many tests show it is best to stay with regular oil for around 2K, then switch. The engine breaks in better with dyno then with syn. Nothing positive with this theory, but it is being looked at closely by some engine manufacturers at this time.

As for Techron, it is the best additive made, and comes in all Chevron fuel, so if you have a Chevron station, good idea to use this fuel at least once in a while. However, with the modern engine I would not worry about fuel/carbon deposits on the head.

I just finished overseeing the teardown and rebuild of five I-5 engine cylinder heads having between 5K and 35K, all burned regular fuel, and not one had any deposits on the pistons. Not sure what fuel used, since the requirements were to use only regular; however, most were run in this area and there are no Chevron stations that I have ever seen.
So, most likely it was BP, Marathon, Speedway (same as Marathon), Shell or Mobil. No additives were allowed, other than what the fuel company normally put in the engine.
Next time we pop a head on an I-5, I'll get a photo, but for right now, this project is over.