Accidentally put 91 Oct in

[Ktulu990]

I use 91 every once in a while.

 

[craigsez]

Lotsa vids online that show no performance diff in the average pump fuels no matter the octane rateing,UNLESS its been tuned for it.

 

[ram1500rsm]

91 octane here too regardless of what the manual says. i've experimented a little more with it adding 2* more to the timing table in the tune, after all the truck is supposed to be tuned for 87 ?, lost little more than 1mpg consistant,i've also removed 2*globally to go in the opposite direction, and the MPG loss is not as bad as adding timing, but not as good as with the stock timing table. it's a crazy thing, oh well, stock timing yields a little better MPG with 91 in my case, i don't know if it's a Socal gas thing or what, but my brother in law V6 Camaro pings like a **** on 87 every time summer comes, same as his Honda Accord, i don't have the heart to do that do my truck, i know the sentiment the Hemi is supposed to run on 87, i don't care, 91 is all she gets in my case, the difference in price is 20 cents between 87 and 91, and i pump 20 gallons at a time, the difference is $4 more per tank......

 

[69GWC]

The 5.7 Hemi is spose to be run on 89 but can be ran on 87.

 

[Ramnewbie]

The 5.7 Hemi is spose to be run on 89 but can be ran on 87.

That's kinda like sayin it's spose to use 5/20, lots of disagreement on that.

Sent from my XT1650 using Tapatalk

 

[69GWC]

Its alittle different, 87 is stepping down in power and a minimum requirement while 89 gets you more power , mileage and a better running truck.


I guess in a sence running 87 is like running 5w20, both are sacrificing something, one is power and mileage and the other is protection and engine longevity.