87 or 89 Gas which do you use?

[Nozzleman]

Me and friend are going back and forth on the type of gas to put in our trucks.
So I have a 6 cylinder etorque and he has a 5.7 hemi.

Does it matter what engine you have and what is recommended.


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[SpeedyV]

93, and sometimes ethanol-free 90. But I’m filling up about once per month.

You’ll find a long thread on this via the search tool.

 

[Whoa_Ram]

89 or 93, mainly 93 as I go to Costco and it’s cheaper then anywhere else

 

[rightushook]

93 at sams unless they're out. It's cheaper than 89 anywhere else

 

[Nozzleman]

93, and sometimes ethanol-free 90. But I’m filling up about once per month.

You’ll find a long thread on this via the search tool.

I tried finding the thread, any chance you have the link?


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[cj7]

93 when I can at Costco (cheaper than locals’ 87 or 89), which is most of the time.

87 whenever I have to buy gas unplanned, except when towing in the hills, then 93.

Not sure it makes a big diff in this vehicle....

 

[SpeedyV]

I tried finding the thread, any chance you have the link?


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This is the longest such thread that I could find with a quick search on "octane":

89 octane recommend, does it really make a difference?

Has anyone actually seen an HP and MPG difference enough to negate the price difference from 87 octane? I just did my first fill up and used 89 just because I was headed out of town and wanted to use what was recommended. Not sure if it's going to be worth it.

5thgenrams.com

 

[theblet]

87 Murphy USA for normal driving. 89 when towing heavy. No issues

 

[sep1006]

87 since day 1. Always fill up at either a Chevron or Texaco with Techron.

 

[Biga]

I've always use 89, usually Shell.

 

[Darkrt]

Mid grade.

 

[jdmartin]

They recommend 89 on the 5.7 at least, so that's what I use, but I don't have a heart attack if I go somewhere and have to use 87. I seem to get 1-2 mpg better on the 89, though I'm not militant about checking it, so I figure I'm probably getting a better compression rate = more power = less throttle since I drive fairly easy = less fuel used. Since I pay more for 89, I figure it's a wash but maybe a little bit better detergents so I make out a little.

I only drive 6-7k miles per year with my truck so fuel cost is mostly irrelevant to me.

 

[Rlaf75]

I used 87 in my 11 and I'm using 87 in my 21

 

[Duran]

89 so ots said better protection from the hemi tick. Either case its good for my engine

 

[grimreefer]

Used to use 87, but after hearing some light "knock" during onramp acceleration in the Florida heat it gets 89 now.

 

[silverWS6]

91 since day 1, that's about as high as it gets around here. Threw some 93 in Austin for about 3 tanks, felt no difference but it felt nice pumping it lol

 

[Caballonegro]

I use 91/92 because of my tune.
I used to only fuel up at Costco, I stopped because hemituner stated whatever fuel I used was crap.
So I ran two tanks of chevron through before redoing my new data log.

The Costco having bad fuel, or should I say the local one, that surprised a little bit.

 

[dano66]

Shell 93

 

[Mirowpl]

89. In my old 2009 I used 87 and truck ran fine, in the new 2020, it seems more sensitive and runs better with the 89 octane

 

[Kicker]

89+, some places have 3 grades, other just 2. I go for the gold.