Gas Mileage
Amateur
Joined: Jan 2011
Posts: 44
Likes: 0
From: Edmonton, AB
Try it, but don't buy too much into it.
Something still seems fishy to me, I did the calcs, sure. With the #'s in the OP. However, I have used from 87-93 octane in the RAM since I bought it, just to see how they do. I didn't notice even 1mpg difference under normal driving, let alone 5mpg. 5mpg gain or loss for switching octanes doesn't seem right.
On there other hand, winter formula in the 87 vs straight formula for the 91 may make a 3-4mpg difference.
Something still seems fishy to me, I did the calcs, sure. With the #'s in the OP. However, I have used from 87-93 octane in the RAM since I bought it, just to see how they do. I didn't notice even 1mpg difference under normal driving, let alone 5mpg. 5mpg gain or loss for switching octanes doesn't seem right.
On there other hand, winter formula in the 87 vs straight formula for the 91 may make a 3-4mpg difference.
Veteran
Joined: Aug 2009
Posts: 266
Likes: 0
From: Kansas
Try it, but don't buy too much into it.
That may explain my change in mileage recently went to 91 octane and noticed about 3 mpg change on the overhead havent used the whole tank yet to see exact amount.
Professional
Joined: Feb 2005
Posts: 156
Likes: 0
From: Woodbridge, Ontario
Try it, but don't buy too much into it.
Something still seems fishy to me, I did the calcs, sure. With the #'s in the OP. However, I have used from 87-93 octane in the RAM since I bought it, just to see how they do. I didn't notice even 1mpg difference under normal driving, let alone 5mpg. 5mpg gain or loss for switching octanes doesn't seem right.
On there other hand, winter formula in the 87 vs straight formula for the 91 may make a 3-4mpg difference.
Something still seems fishy to me, I did the calcs, sure. With the #'s in the OP. However, I have used from 87-93 octane in the RAM since I bought it, just to see how they do. I didn't notice even 1mpg difference under normal driving, let alone 5mpg. 5mpg gain or loss for switching octanes doesn't seem right.
On there other hand, winter formula in the 87 vs straight formula for the 91 may make a 3-4mpg difference.
Higher octane is largely used to run an engine that requires it such as boosted or high compression applications to help manage detonation. It’s never been used to increase mileage of a vehicle.
Don't take my word for it.
Read this:
http://www.truckblog.com/447-fuel_ec...s_fuel_economy
Registered User
Joined: Feb 2011
Posts: 17
Likes: 0
From: Ottawa, Ontario, Canada
Are we checking the Ethanol content of each gas? I know that some regular unleaded in my area range from 10% Ethanol content for Regular, 5% for Mid-grade and most of the time 0% Ethanol for Premium. If Ethanol hurts MPG, then this could explain why.
Also, unsure if this has been stated before, but the Ram HEMI is designed for mid grade for its full output. If you put Regular in it, the timing retards and thus, less power is made. This is a heavy truck, so it will take more fuel and air at Regular octane because of the retarded timing vs if the truck was running on Mid-grade and has its full power output potential.
retarded timing+ higher ethanol= low gas mileage. We need to dyno the truck on Regular and then on Mid-grade to see the power difference... but i think this gas test the OP did may justify what i explained.
The 0 Ethanol content alone in 91 octane fuels might even make the MPG jump worth it vs Mid-grade's known 5% Ethanol content... food for thought Ram owners!
Also, unsure if this has been stated before, but the Ram HEMI is designed for mid grade for its full output. If you put Regular in it, the timing retards and thus, less power is made. This is a heavy truck, so it will take more fuel and air at Regular octane because of the retarded timing vs if the truck was running on Mid-grade and has its full power output potential.
retarded timing+ higher ethanol= low gas mileage. We need to dyno the truck on Regular and then on Mid-grade to see the power difference... but i think this gas test the OP did may justify what i explained.
The 0 Ethanol content alone in 91 octane fuels might even make the MPG jump worth it vs Mid-grade's known 5% Ethanol content... food for thought Ram owners!
Last edited by CaptObvious75; Apr 5, 2011 at 03:47 PM.
Professional
Joined: Jan 2011
Posts: 226
Likes: 0
Are we checking the Ethanol content of each gas? I know that some regular unleaded in my area range from 10% Ethanol content for Regular, 5% for Mid-grade and most of the time 0% Ethanol for Premium. If Ethanol hurts MPG, then this could explain why.
Also, unsure if this has been stated before, but the Ram HEMI is designed for mid grade for its full output. If you put Regular in it, the timing retards and thus, less power is made. This is a heavy truck, so it will take more fuel and air at Regular octane because of the retarded timing vs if the truck was running on Mid-grade and has its full power output potential.
retarded timing+ higher ethanol= low gas mileage. We need to dyno the truck on Regular and then on Mid-grade to see the power difference... but i think this gas test the OP did may justify what i explained.
The 0 Ethanol content alone in 91 octane fuels might even make the MPG jump worth it vs Mid-grade's known 5% Ethanol content... food for thought Ram owners!
Also, unsure if this has been stated before, but the Ram HEMI is designed for mid grade for its full output. If you put Regular in it, the timing retards and thus, less power is made. This is a heavy truck, so it will take more fuel and air at Regular octane because of the retarded timing vs if the truck was running on Mid-grade and has its full power output potential.
retarded timing+ higher ethanol= low gas mileage. We need to dyno the truck on Regular and then on Mid-grade to see the power difference... but i think this gas test the OP did may justify what i explained.
The 0 Ethanol content alone in 91 octane fuels might even make the MPG jump worth it vs Mid-grade's known 5% Ethanol content... food for thought Ram owners!
Veteran
Joined: Jul 2010
Posts: 292
Likes: 0
I did a trip to Toronto yesterday to pick my Dad up at the airport. I rarely switch my my #'s over to MPG from L/100kms, but I did, and this is what I was averaging on 87 octane. Sorry for the flash, didn't want to be playing with the phone too much on the highway.
Truthfully, I doubt I can do much better, even with higher octane, but I am going to try it when the price comes down a bit (if it does! LOL)
Truthfully, I doubt I can do much better, even with higher octane, but I am going to try it when the price comes down a bit (if it does! LOL)
Registered User
Joined: Jan 2011
Posts: 12
Likes: 0
From: BC
I try to drive try to drive very conservatively but I'm getting 14 mpg/ 16L/100kms. I switch from 87 to 89 octane & gas up a Esso or Chevron. I also drive about 100 kms or more per day so I with that I could get the numbers people claim.
Thread Starter
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Rookie
Joined: Sep 2008
Posts: 64
Likes: 0
From: Mt Albert
I'm finding the Shell 89 is the best for milage so far, with consistantly getting over 700km per tank. I just installed a K&N filter (on sale for $65.00) in place of the factory filter and noticed more of an improvement on milage. Haven't finished this full tank yet, but look like the K&N filter will increase the milage by 20+ km per tank. I drive 70km one way to work each day, 140km round trip. Driving down to work, the average is 11.5, and coming home is 12.6. There is a small change in elevation from my house to Toronto.