It seems as though this thread died - but I discovered the forum only today and just read all 7 pages of this topic. Wondered how you're currently making out, @jamie1073
I live in NEPA - cold winters and lots of hills. I drive 60 miles round trip to work 5 days a week, typically driving between 75-85 mph (on roads with speed limits of 45-55 mph.... shhhhh, yes, I know my time is coming). I am a RIDICULOUSLY aggressive driver, which I know affects gas mileage. I currently have a little over 7k miles on it, and my average MPG is around 23 running 87 octane gas (now, since I'm not remote starting during the winter - then the average was around 22). I ran 3 tanks of 93 octane about a thousand miles ago, and MPG only bumped up to 24, and I honestly did not notice any performance improvement at all - so I'm back to 87 again.