Based on what I have seen and used, (104 Octane Booster) all I got from it was red fuel and discolored valves. If the engine has a compression ration that will run on 87 octane, adding more will not help. Now if the said engine has hot spots on the head, odd ball pistons, or timing out of whack, then the higher octane could help. My stock 250 has 8.0 to 1 compression, running 87 octane or 93 octane (no corn added), the mileage and performance is always the same. I have run plenty of test for fuel mileage, so I stand by this one. Even my race car didn't show any difference when going up on octane, the engine was happy with what it had. My '85 Dodge 318 used to ping like made on 87 octane, I sold it with 200,000 miles on so I can't say how long it kept going and pinging.
Again, this is my observations, if you get good results, that great, it keeps the old trucks out on the road where they belong!