5.7 Hemi and Octane ratings

Bluegrass James · Oct 31, 2011

the dealer says 87, which i wouldnt believe based on that. The manual says 89, optimal, 87 okay/

wondering if yall have noticed any difference in performance or fuel economy between the two, what you think generally, etc. on balance its a small extra to pay for mid grade here, roughly 12 cents a gallon. just wondered if necessary...

quietpeen · Oct 31, 2011

I have been running 87 in mine since i got it and it runs great

LB3711 · Oct 31, 2011

I went to 89. I did notice some minor hesitation/pinging with 87. So I dumped a bottle of seafoam in the tank and run 89 now and it's better.

Sent from my tapatalk equipped AT&T iPhone 4.

KGBIGCOUNTRY · Oct 31, 2011

Have you heard any pinging in the motor or knock? The higher the oct the less chance of knock.

garner · Oct 31, 2011

87 to me felt sluggish probably due to motor pulling timing cause of knocking. I only use 89 or 93 now

WhiteExpress · Oct 31, 2011

I always run premium. Stupid high altitude and lots of long steep hills.

Rotzilla · Nov 1, 2011

I run 85 octane, never had any problems.

bigbadram1500 · Nov 1, 2011

I run 89 in mine but have run the other grades and didn't notice a difference.

BlkPearlSport11' · Nov 3, 2011

Well I use nothing but 93 octane in mine gets way better milage on it too!

EJM05 · Nov 3, 2011

I use 87 and never had a issue. when i get a tuner, well i will run higher then.

donjohnk · Nov 4, 2011

i ran 89, then got expensive went to 87 for almost a year, egr valve went then went back to 89..

HemiBabe · Nov 4, 2011

I use 93 octane and Superchips performance tune... runs awesome

[ tapatalkin ]

09SMOKINHEMI · Nov 7, 2011

i wonder if the higher octane changes the mpg's..... first 2 tanks of gas on my 09 were 89 octane, and the gauge read "410 miles to empty", then I just filled up with 87, and it ready "372 miles to empty"...... not sure what happened there...

TXSport · Nov 7, 2011

I get better mpg with 87 but less pinging with 89 when getting on it...

joetama · Nov 8, 2011

TXSport said:
I get better mpg with 87 but less pinging with 89 when getting on it...

Correct me if I'm wrong, but I don't think you 'should' have any pinging.

Sent from my VS910 4G using Tapatalk

JB1 · Nov 8, 2011

filled up with 89 today but Im going to try 93 next tank. I just bought my truck 10 days ago and finally ran out of whatever the dealer had in it so no comparison for me yet.

AirborneSilva · Nov 8, 2011

I've run 87 twice and did see a decrease in MPG's, performance wasn't much different though. I always put 89 in it now.

TXSport · Nov 11, 2011

I get plenty of pinging running 87...one would think we shouldn't with as much computer control this thing has.
I have only heard the ping under wot and never with 89 only 87. Its even worse when I have the trailer hooked up and trying to merge into traffic....with 87. I run 89 all the time now and don't have an issue with ping.

I have built race cars all my life including turbo charged applications. I know about predetontation.

Shibito · Nov 21, 2011

I got noticeably worse gas mileage with 87. Ran 93 for my first 5 tanks, went to 87 for 2 tanks and gas mileage dropped by almost 2 mpg. Driving habits are the same.

On 93 I averaged 19mpg on the highway, on 87 I'm struggling to keep 17mpg.

In the city Ive averaged 13-13.5 on 93, compared to 12mpg on 87.

This is just my experience in the 2800 miles I've put on my truck since buying it, I will be going back to 93 permanently.

Five.SevenlExpress · Nov 22, 2011

89 or higher for me....

5.7 Hemi and Octane ratings

Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Senior Member

Member

Senior Member

Senior Member

Senior Member

Member

Member

Senior Member

Similar threads

Forum statistics

Share this page