DODGE RAM FORUM - Ram Forums & Owners Club! - Ram Truck Forum - View Single Post - octane rating
Thread: octane rating
View Single Post
Old 06-06-2012, 07:37 PM
docgatling docgatling is offline
Dodge Ram Forum Newcomer
Join Date: May 2012
Location: So Cal
Posts: 20
Gender: Male
Vehicle: 2012 Ram 1500
Trim Level: Outdoorsman 4X4
Color: white
Engine: 2009-20?? 345ci (5.7L) Hemi V8 390hp 407lb/ft
Rep Power: 0
docgatling is on a distinguished road

In the old days if your motor suffered knock you switched to higher octane. Modern cars (and trucks!) have knock sensors to prevent damage to the engine if to low octane in injected. Your eingine will run but suffer in the preformance department. So, I would run a couple tanks of both and see how your engine performs. Monitor your gas mileage with 89 then try 91. If you don't see any difference use the "cheaper" stuff. There is a good article in Road and Track about octane and its effect on engines. It's not just about compression anymore.
Reply With Quote