Any advantage to using premium fuel

[Foogie]

There's a MotorTrend article from 2022 or 2023 that I wanted to paraphrase regarding the SO Hurricane. Bottom line: It stated that the advertised power numbers were generated on 89 Octane (Mid-grade) fuel. Their (RAM) website recommends 87 for SO while the owners manual page is above a few posts. I'm running 87 and will continue to do so I think until I tow my boat in the spring then I will switch to 93 octane. I might mess around with 89 octane just to see if I notice any difference in performance or mileage.

 

[Foogie]

Ford's EcoBoost 3.5L runs on regular and that owner's manual basically says the same as our manual regarding 91 octane. Mine runs great on 87. I had a buddy years ago who ran his Audi A4 on regular despite it "requiring" premium. No issues.

 

[Ramit392]

Unless i missed it in the owners manual, Or it changed for the 24s, the recommended fuel for the 5.7 hemi is 89 (mid grade) but it says 87 is acceptable. 85 is a nogo

Prior to 23 model hemi's called for mid-grade. Not regular. My 2023 when I had it called for Regular or mid-grade. I ran regular in it for 34000 miles I had it with no issues.

 

[HSKR R/T]

Prior to 23 model hemi's called for mid-grade. Not regular. My 2023 when I had it called for Regular or mid-grade. I ran regular in it for 34000 miles I had it with no issues.

The Hemi always "recommended" 89 but 87 was acceptable.

 

[Ramit392]

I was just quoting from the Rams I have had in the past.... I had the first year the Hemi came out in 2003, and it called for Mid Only. Same with three others before 2023 a couple preferred mid-grade not Regular until 2023 Hemi. I noticed the Compression ratio changed on the Hemi from my 2019 one to the 2023. A little lower compression ratio 2023. The 23 never ran as good as any Hemi I had before that, with all them Laramie's.

 

[HSKR R/T]

I was just quoting from the Rams I have had in the past.... I had the first year the Hemi came out in 2003, and it called for Mid Only. Same with three others before 2023 a couple preferred mid-grade not Regular until 2023 Hemi. I noticed the Compression ratio changed on the Hemi from my 2019 one to the 2023. A little lower compression ratio 2023. The 23 never ran as good as any Hemi I had before that, with all them Laramie's.

All the 5th gen Rams owners manual say 89 recommended, but 87 acceptable. 2019 to 2024. Not sure where you are getting the compression ratio numbers from because the engine really hasnt changed since 2013. 2003-2008 had different heads, and no VCT.

 

[Gren71]

Prior to 23 model hemi's called for mid-grade. Not regular. My 2023 when I had it called for Regular or mid-grade. I ran regular in it for 34000 miles I had it with no issues.

your not wrong since it can run on both, but the owners manual for my truck says 89 os recommended for optimum performance. So thats what i stick with. Especially since I tow often 9 months out of the year.

 

[theblet]

your not wrong since it can run on both, but the owners manual for my truck says 89 os recommended for optimum performance. So thats what i stick with. Especially since I tow often 9 months out of the year. View attachment 198023

This. Use it when you need the power. Otherwise it’s not worth the money, at least for me

 

[Ramit392]

your not wrong since it can run on both, but the owners manual for my truck says 89 os recommended for optimum performance. So thats what i stick with. Especially since I tow often 9 months out of the year. View attachment 198023

You're not wrong either lol.............. All quoted from 2019 Ram Owner's manual: The use of 89 octane “Plus” gasoline is recommended for optimum performance and fuel economy. Hemi's hate anything below 89 Octane. I have run 87, and it knocked and pinged, never ran it ever again after one time. Many owners reported long term use of 87 made the dreaded "PING" start in theirs, and even after going to 89 it never went away.

 

[theblet]

87 vs 89 doesn’t really make a difference in mpg as the manual says. Good quality 87 should suffice

 

[jbourne]

A few years ago, when I was running a '19 hemi, I towed a 30' RV from South Texas to California for work, and while it was getting the job done, she was struggling. I had to keep her in 5th gear, or she would hunt through the gears, and I was only getting about 7 mpg. Halfway through the trip, I switched to the highest octane I could find as an experiment. I was damned surprised on what a difference that made. I was able to run in the bottom of 7th (as opposed to the top of 5th) and my mpg jumped to 11. Not sure if the SO will have that kind of difference with higher octane fuel, but I'm planning on pulling my boat with it this summer and will be using the good stuff for the haul. Currently running low octane on my SO with no issues. 14,000 miles on the ODO.