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What octane do you use in rt?

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#22 ·
Generally I put the highest octane (up to 94) in in one fill then when down by 1/4 to half a tank, fill up with 87. For the most part, I ensure that it's blended to more than 89 octane because:
The truck holds 4cyl mode longer with the higher octane for sure. A little more pep at lower rpm.
 
#23 ·
You can run 87 or 89 on a stock 5.7 Hemi.

With that being said, I do run 93 in all my Hemi's.

I will add a little MS109 for the 6.2 since winter gas here is crappy.
 
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#24 ·
In my 5.7 Charger I did significant testing of pure highway mileage and over 1 mpg more. So when we got the Durango R/T we have always used 89. My wife does tow a 2 axle horse trailer.

Now my previous 06 Grand Prix with Supercharger definitely ran better all around with 91/93.
My son's Daytona 392 is 91/93.

I think in a supercharger/turbo or higher compression engine you a missing a few HP with lower octane.
 
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#25 ·
Heat00 said:
Just curious as my 2015 5.7 said 87 if I remember correctly but I see a newer manual that says to use 87 in the v6, 89 in the 5.7, and 91 in the 6.2 or 6.4. Just curious if 89 is really needed or 87 is sufficient.
Thanks


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I use only 89 in my 2020 R/T too!. Better for the performance of your engine overall!! Definitely go with what the most current manual suggests. R/T 89 and most importantly, like my Dad taught me, be consistent, always use 89.
 
#33 ·
On a stock tune, there is ZERO reason to use higher octane, unless you literally don't like having money. The octane rating of a fuel does nothing to make more power. It simply makes the fuel less likely to self-ignite under pressure/heat in the engine. There have been MANY studies on this. If you are driving a 5.7 with a stock tune, you do not need anything higher than 89... period. In order to make more power, you would need to advance the timing further than the factory tune does. That might cause detonation (knock) and at that point, you could potentially benefit from higher octane fuel. But without an aftermarket tune, you are just wasting money with anything more than 89.
 
#34 ·
Yes I have heard it before, but my Audi is boosted/tuned and requires 93, Mustang GT is modified and tuned for 93, my LX 5.0 has 486HP+ and you get the drill... so new DD gets 93.

I stockpile fuel for generators (I live in Miami), so I cycle through stored fuel every few months. Again, another reason why the lawn mower gets 93.

Also, 93 is $3.99 where 87 is $3.26, the difference on a routine fill up (i.e., 20-gallons) is around $14.00 difference which I can live with... DD gets filled up once every two weeks, so that's less than $30.00 a month to have the best grade of gas available for all my internal combustion engines.

There is a method to my madness. LOL :)
 
#36 ·
I use 89 and maybe once or twice a year I use 93 for the added cleaning properties it has.
My wife's jeep is 87 with a couple of times a year 93 for the same reason.

I miss the days of 93 only in my SRT10 even at $4.50+/gallon back in 2008
 
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#37 ·
I only use 87 in all my vehicles with no issues.
 
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#38 ·
I run 89 in my 2022 RT, as recommended. I run a tank of 93 thru it every 3 or so months.
I also only use name brand, Shell, Exxon or similar. Where we live in SC fuel quality is questionable at best, so I do my best to use the same location and name brand fuel as much as possible.
 
#40 ·
I once ran a tank full of 130 octane. A cop pulled me over, concerned about the conical blue flames coming out of the tail pipes and the red underbody glow from the exhaust system being at 2500°F. I told him to get lost and I floored it. I accelerated so quick that despite the speed limiter activating at 118mph, I was able to hit 153 by coasting alone. I would have gotten away but my tires and pistons melted.

So now I just stick with 87 octane.
 
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