I'll take your word for it since you own the Hemi. Wanna swap? I'll keep my body and take your Hemi.

 

We once did a test with fuel grades on an old Chevy. We discovered that the lower grade gave us better fuel economy. Many people are surprised by this because they think that higher cost/higher octane will equal better mileage. From what I've seen this is not the case, and it's quite possibly the opposite.

Also, I've heard it is not uncommon for the same grade to be used for both 89 & 87 at gas stations. But that's merely rumor.

I will have to look back at my manual and see what it says about using 87. I wouldn't mind using 87 if I got better economy and the D ran fine.

 

Wow, what a response. I guess I just Worded My original Post Wrong............................

 

I usually use 87 Octane and have no issues at all.