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  #11  
Old 06-06-2014, 09:44 PM
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CCeastside CCeastside is offline
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run diablo 91 octane tune.... so BP 91 fuel with a bottle of Techron once a month and my 83K +, 2010 SLT CC runs strong
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  #12  
Old 06-10-2014, 02:20 AM
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93 using a custom 91 diablosport tune.
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  #13  
Old 06-10-2014, 08:59 PM
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I run only the recommended 89 octane and am happy with performance and thoroughly happy with fuel mileage. I have 3 friends with gen 4 Rams who all use the accepted 87 octane with no complaints of pinging or anything. However, one of them ran 89 for a couple tanks and he said without a doubt he could definitely feel a slight performance gain. I'm not tuned to take advantage of a higher octane so I'm sticking with good old factory recommendations.
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Old 06-10-2014, 11:24 PM
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Kamanhart said it best. The higher octane assists with minimizing detonation or ping. I noticed this under heavy load, especially when towing if I used 87. With 89, the pinging was still noticeable but went away slightly quicker. With 93, I don't hear any pinging. Sure the butt meter probably won't feel a big difference, but the health of your Hemi will thank you for it, and it's only an extra 4-5.00 bucks to fill up with 93 compared to 89.
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Old 06-11-2014, 11:47 AM
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do just fine with 89oct
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Old 06-14-2014, 11:37 PM
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I have used both 87 and 89 and have not noticed any difference between the two, other than cost-consequentlyI use 87. My dad has about 65,000 miles on his 2009 Ram 1500 5.7 and has run 87 exclusively with no problems.

You don't need to run higher octanes to get maximum performance from this engine in stock form OP, unlike the ecoboost you described.
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Old 06-16-2014, 10:48 AM
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I have been running 89 since the manual seems to indicate it has the preferred octane, with 87 being acceptable, and since 89 is only about .13 cents more per gallon in my area. Also, I tow a fairly heavy TT and with 89, I get absolutely no pinging and the truck tows it well. Using any higher octane than what is called for by the manufacturer is a waste of $.
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  #18  
Old 06-20-2014, 11:10 PM
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I run mid grade 10 percent ethanol. Sometimes I don't realize and I fill with regular. I don't notice a difference in mileage and I drive a lot. I don't tow. The ethanol mix is not by choice, I just can't buy pure gas in NJ. I'm sure my fuel economy would be better if I ran pure gas though. Otherwise the octane doesn't seem to make a difference for me. I've never tried super, maybe I'll fill with that next time and see if I notice anything.
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  #19  
Old 06-20-2014, 11:23 PM
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I run 93 because of advanced 91 tuning on my SuperChips.
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  #20  
Old 06-24-2014, 05:11 PM
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I run 87 normally except when I tow.

Now, I have tested this as best I can. Normally, if I am on a run to, say, Cleveland from NJ, I've got 400 miles of highway and I've done trips out using 87, and I've also run 89. I get .5 to 1 mpg better running 89. Truck just runs better, especially with a heavier foot. I have also found similar MPG gains in my city/highway loop during the week. Most of the time, I think the economics favor 87 even with the slight drop in economy, but I will go to 89 for a week if I know I'm towing that week. I won't run anything more than 89 as I figure if the programming won't benefit from the higher octane (I don't use a programmer or anything), then I'm just tossing money out the window.
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