ramffml
Senior Member
- Joined
- Jul 12, 2019
- Posts
- 2,832
- Reaction score
- 5,222
- Location
- ramforum
- Ram Year
- 2019
- Engine
- hemi 5.7
2017 Ram Rebel, using 87 octane for years, with occasional fuel injector cleaner, trouble free, runs fine.
"runs fine" is ok, runs amazing is better. My truck runs the best on 91 its not even close. Ping is noticably less especially while towing, and it probably derates your truck by 15 hp by running 87 (Nissan actually gives two different power figures based on the octane and there is about a 10 to 15 hp difference IIRC, the hemi will probably be similar).
So the pinging is obviously better, I like to think I notice the power difference as well. Never noticed an MPG difference though because there are way too many variables for that, unless you always hand calc the exact same MPG you'll never notice the savings from 91.
I run the 91 due to the ping first and foremost, I want to keep that minimized. Power "gains" (or rather, "no losses") is a great bonus and if I save fuel too, so be it.