What gas are you pouring in your 16?

Where did I say 91 octane is required? All I said was it was designed to run on 87 to 91 octane so that means 87 octane can still be used.

Old man, you better get your eyes checked before you wreck your new truck.

 

OK, enough - you said right there that this engine is designed to run on 91 optimally. It does not. There is no documentation that says that and the doc you posted is in all likelihood implying 91 RON method which is the same as 87 RM/2 at US pumps. This truck and pretty much every vehicle sold in the US today runs just fine on 87 as designed and get zero benefit from 91. 87 is going to be more performant unless you are having a knocking issue in these vehicles - go re-read about gasoline at links others have provided. Older higher compression vehicles and engines are for some other discussion, not this one.

 

It can support higher but it is a waste of $ as others have outlined. You have claimed it is optimal, it is not stated in any known docs that it is optimal.

 

He is STILL trying to make his argument?? LOL

BTW That has been his claim all along...91 will run better because the ECU will optimize for it......Ugh Can't teach the Young and ignorant. I have not read anywhere Toyota claims higher octane will deliver better power and more MPG....Probably because it's a myth. Surely Toyota would indicate that for best results use 91 Octane.

I am guessing he still won't "get it"

 

Regular would "work great" too and save you money.

 

There is no magical elixir in premium fuel that will make a vehicle not specifically engineered for it run better on any level.....All you get is a thinner wallet and slower burning fuel. nothing more and a feeling that you are doing something to make an engine last longer run faster and get more miles per tank....