Does the warranty give you more hp also?
I like how you used to argue there was no difference between the grades of fuel and now you're arguing the economics. Why does it bug you so much that some of us are willing to spend the extra coin to use the RECOMEMDED fuel grade for maximum performance? Are you a Saudi oil prince that only sells 87?
I'm actually arguing both. There is no realized different between the grades and I'm also arguing for the economics.
The gain in HP is likely only at high rpm and still is not enough for most to even notice. But by all means, if you are racing your truck then you should likely use it for that slight increase you may get. If I gave you 2 trucks to drive, 1 filled with 87 octane and 1 with 91 octane, you would not be able to tell me which is which.
I use 87 or if convenient to get, will pay more for 88 non-ethanol. (as that is actually better for the engine)
I could not care less what fuel you use, go use 106 octane racing fuel if you like. I can get that near me for $9.99/gal
But my point in my posts is for those who are looking for real information and not just "feelings". If you "feel" that 91 octane protects your engine (it doesnt) then go ahead and use it. If you "feel" it makes your truck faster in daily driving (it doesnt), then go for it!. Most people are like you and just make decisions on feelings, thats fine.
But some readers on here may prefer to use facts and reason. To each his own. I dont begrudge either.