89 vs 91 Octane

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IIIOIISTER
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89 vs 91 Octane

Post by IIIOIISTER » Thu Oct 05, 2017 3:11 pm

Been using 89 Octane gas since I bought the '17 PW 7,000 miles ago, since it was the recommended octane per the manual. Tried 91 octane once or twice and didn't notice any improvement. What are some of your guys' experiences with running 91 octane for long periods of time?
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BoldAdventure
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Re: 89 vs 91 Octane

Post by BoldAdventure » Thu Oct 05, 2017 3:16 pm

Don't bother. It's a waste.
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04Ram2500Hemi
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Re: 89 vs 91 Octane

Post by 04Ram2500Hemi » Thu Oct 05, 2017 3:17 pm

I had a 2004 HD Hemi that I ran nothing but 89 in. The same is true for my 2012 Power Wagon. I don't see any point in running 91 in our trucks.
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Re: 89 vs 91 Octane

Post by Mule » Thu Oct 05, 2017 8:01 pm

Best octane to run is the lowest that doesn't det.

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Reloaderguy
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Re: 89 vs 91 Octane

Post by Reloaderguy » Thu Oct 05, 2017 9:15 pm

Mule wrote:Best octane to run is the lowest that doesn't det.
Modern engines have knock sensors that prevent detonation. You'd need to look at your timing in real time to see if the computer is retarding ignition. Otherwise you're left with calculating fuel economy.
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Re: 89 vs 91 Octane

Post by BoldAdventure » Sat Oct 07, 2017 9:01 pm

Yup. I think the whole premium myth comes because usually performance vehicle air those with turbos run premium. And so others equate that maybe premium will equal a performance increase in normal vehicles.
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Re: 89 vs 91 Octane

Post by FordyceCreekTrail » Sun Oct 08, 2017 10:51 am

The new Twin Turbo Raptor literally wont even run with out premium. So maybe it gets 1-2 mpg more but you have to pay 40 cents a gallon more. Hello
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Re: 89 vs 91 Octane

Post by TwinStick » Mon Oct 09, 2017 10:15 am

If I am towing the camper in hill country, I run super. Just better safe than sorry is my thinking on that. Never had an issue. But the rest of the time i just use 87.
Traded to 2019 ZR2, Red.

4Runner was a GREAT vehicle but could not even tow our 6x10 enclosed utility trailer comfortably, even when it was empty-ish.

It was time. Truck was still leaking BADLY every time it rained or snowed & melted. It was leaking at every single gasket (rear window, front window, all 4 doors). You could sit inside & watch it run down the inside of windshield, rear window & drip off the upper side door beams. It was molding on the inside & starting to stink. Needed new steering gearbox, shocks, new upgraded T-style steering, tires, brake lines, d/s manifold bolts that are barely recognizable due to rust-removed & replaced. Everyone around here would not even touch em once they looked at them.

So, say what you will. PW turned into a money pit. Was no longer a joy to drive. Hoping that this downsized 4x4 with lockers will fill the bill & have minimal problems, but..... As long as manufacturers keep making engineers design things that fail soon after warranty is up, we are going nowhere fast. Regardless of what you buy. :rockon:

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