Just bought 2011 ram big horn with the 5.7 hemi. Was just wondering what you guys are running in yours and why . What gets better mileage , fuel brand , 87 or 89 or 91 .
In our 2012 Durango with the 5.7 Hemi, the owner's manual says to use 89 octane. We have found that there is no difference in performance or economy when using 87 octane.
2010 Ram 3500, Crew Cab, Long bed, 4 x 4,Dually, Lights & Siren!
I ran 91 for years in my Land Cruiser, then a while back experimented and switched to 87 which I've run ever since...could be psychological but I feel it actually runs better on 87 and there's been no change in MPG at all.
I know you asked specifically about your Hemi but just thought I'd share my experience, as I now feel that running all those tanks of 91 was a waste of money!
BManning baking in Phoenix
2008 Ford Super Duty F250 XLT, 4x4, crew cab, 6.75' bed
5.4L V8 300hp/365ft-lb, 5sp Torqshift, 4.30 AAM gears
9400lb GVW 11200lb tow
2007 Volvo XC90 AWD V8
4.4L 311hp/325ft-lb, 6sp Aisin, loaded
6100lb GVW 5000lb tow
doctarie wrote: Just bought 2011 ram big horn with the 5.7 hemi. Was just wondering what you guys are running in yours and why . What gets better mileage , fuel brand , 87 or 89 or 91 .
Thanks Bob
I'm running 87 in my Ram 2500, which is mid-grade at the elevation I live at. The manual says 87 is acceptable, while 89 is recommended.
I'm heading up to Yellowstone in a couple weeks and plan to experiment with running premium. In theory, an engine with variable valve timing like the Hemi can adjust to higher octane and produce more power and better throttle response. I'll see if there is a noticeable difference.
doctarie wrote: Just bought 2011 ram big horn with the 5.7 hemi. Was just wondering what you guys are running in yours and why . What gets better mileage , fuel brand , 87 or 89 or 91 .
Thanks Bob
I'm running 87 in my Ram 2500, which is mid-grade at the elevation I live at. The manual says 87 is acceptable, while 89 is recommended.
I'm heading up to Yellowstone in a couple weeks and plan to experiment with running premium. In theory, an engine with variable valve timing like the Hemi can adjust to higher octane and produce more power and better throttle response. I'll see if there is a noticeable difference.
Your going the wrong way with octane. The higher up you go the less octane you need. That is why places like Denver has less octane in their gasoline.
~ Too many freaks & not enough circuses ~
"Life is not tried ~ it is merely survived ~ if you're standing
outside the fire"
Due to the price I only run 89 when towing and 87 when not. I have towed with 87 and get slightly less (like 0.2) MPG. With 89 you can have more timing giving more power. On the Dodge forum they say continued use of 87 will cause the EGR to carbon up and possible piston damage. But everyone I know that has a HEMI runs 87 for normal use and has no issues.
You guys in the US think gas is high...In Vancouver Canada
87 is $5.44/g
89 is $5.81/g
Diesel is $5.67/g
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