What gas octane???

The Ram 6.4 runs fine on 87 octane which is what is recommended by Ram.

I agree with the above comments, especially the cheap gas problem. Around here, the independent brands don't have their own refinery/distribution system so buy their gas from others. Basically, they get what's leftover after the refinery puts out its trucks for the day. So, I stick to major brands.

When I was a super-bike racer and rode my bikes between races, I learned from others which brands were the best. Back in 80s, Union76 and Texaco were best, Chevron was 2nd best (of what was available to me here). So, you might Google gas quality and see what you learn. Of course, on the road, you often have no choice! :)

Bill

If you drive on steep grades, putting higher octane will make the engine working better.
Modern engines have anti-ping sensors, so they will adjust for lower octane if you use it, but lowering the performance will make for gear downshifting and in the result - higher fuel consumption.

We have found that in the MH I must push hard on the throttle using the 85 octane. We stay with the 87 octane. We get a little better mileage with 87 over the 85 octane.

Dennis12 wrote:
Use what the manufacturer recommends.

X2.
Some will tell you to use the cheap stuff but the effects of doing so will add up.

Use what the manufacturer recommends.