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?
'17 Power Wagon
35" Yokohama Geolander G003
Carli
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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.
2012 Ram Power Wagon: http://forum.powerwagonregistry.org/vie ... f=13&t=107
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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.
In WNY State. 2008 Red QC PW G56. No lift yet, stock size tires. It pulls an 18' 2016 Starcraft AR One Extreme, 3500 lbs.
Load Pro 35 helper springs. 2015 A.R.E. MX Series custom cap. PCP front diff cover protector. Mag-Hytec 6 qt rear diff cover. K&N replacement air filter only. Dual grounded throttle body. Winch TPC bypass. Fab Four rear bumper. DURA BAK lined rocker protection. And a bunch of new front end stuff.

G-56 Gear ratios: 1st) 6.29:1 2nd) 3.48:1 3rd) 2.10:1 4th) 1.38:1 5th) 1.0:1 6th) 0.79:1 Rev 6.29:1 --- = 78.01613:1 Crawl Ratio
-------------------------5.94:1--------3.28:1-------1.98:1-------1.31:1-------1.0:1-------0.74:1-----5.42:1 ---- = 73.675:1
545RFE----------------3.0:1---------1.67:1--------1.0:1--------0.75:1-------0.67:1------------------3.0:1 -------=37.21:1

2013+ 32.47 crawl ratio...............Can you see the trend ??????????????

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