@JasonH ...Not to continue to beat this dead horse, but I used to run premium for the HP, second, to run better. So, to quote me, $12-15 bucks for 10-15 HP isn't worth it...to
ME. I've never seen my gas mileage "better" with premium. I track every tank. At least, nothing major enough to say, "gotta run premium". I think it's very hard to
ever compare tank to tank. Different roads, different traffic, different temps, etc. I will say, since I broke 50K miles, my gas mileage is up, consistently, by about 10%....using regular. I will admit, it does run smoother and has more grunt running premium. I do put in premium sometimes if I'm topping off. Other than that, regular it is. I don't really care anymore as my truck is five years old and I don't really think it'll be here next year, but who knows.