I've used it before as well, but i've also had an experience where a car's headgasket fail right after. Same reason why Honda tells mechanics NOT to do any engine flush as a maintenance. I'm sure it's ok, but just the risk scares me. Hate for something like that to wreck my engine.
So I got about 420 to the tank probably could've gone just a little bit more, filled up with plus 89 octane or w/e heavy on the pedal only about 10% freeway 85% not bad lol.