Queston for 6.2 guys E85 OR....
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New User
Joined: Jul 2017
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Queston for 6.2 guys E85 OR....
im buying a 2017 6.2 around the end of December
and im trying to read up on them as much as possible.
Are you guys running E 85 or a higher octane ratings in your engines?
i am well aware that a higher octane doesn't give you more horsepower but ive heard people are getting different MPG numbers with different ratings
Can anyone possibly chime in and tell us what your running and how different ratings effect your engine?
THANK YOU!
and im trying to read up on them as much as possible.
Are you guys running E 85 or a higher octane ratings in your engines?
i am well aware that a higher octane doesn't give you more horsepower but ive heard people are getting different MPG numbers with different ratings
Can anyone possibly chime in and tell us what your running and how different ratings effect your engine?
THANK YOU!
Senior User
Joined: Sep 2016
Posts: 119
Likes: 1
I don't currently run the 6.2 but I can tell you that E 85 will be drastically lower MPG as compared to 87 octane petrol. 1.5 gallons of ethanol has the same energy content as 1.0 gallon of gasoline. A flex-fuel vehicle will experience about 76% of the fuel mileage MPG when using E85 (85% ethanol) products as compared to 100% gasoline.
The only benefit I see in using higher octane fuel over 87 is some companies will use Ethanol in lower grade fuels.
The only benefit I see in using higher octane fuel over 87 is some companies will use Ethanol in lower grade fuels.
More Turbo
Joined: Oct 2007
Posts: 643
Likes: 38
From: LA = Louisiana
From an earlier thread with about the same title...........
Just drove my 2016 F250 6.2 round trip Calif to Montana, 2000+ miles. Drove with AC on for about 8 hours per day, average speed 75. I was getting an average of 14.7mpg. This trip included several mountain passes over 8000ft. Couldn't be happier. The truck would run smooth as silk at 80mph with the cruise control on. This was the first trip I ran on E85 gas, I normally run 87. I paid $2.55gal for 87 and 2.05 for E85. The difference in performance was minuscule. Loved it.
Cross-Country
Joined: Apr 2017
Posts: 83
Likes: 2
From: 9200' Colorado
I just ran a 3100 mile road trip. Sales truck, never going to tow with it.
Owners manual says to use 89 octane which we don't have in Colorado so I run 91 Around town at home I get roughly 11.5-12.5 mpg.
On trip I found 89 octane in Texas so I ran that, around town got around 12.5 mpg. On highway runs running 75-80 mph with AC on got up to 13.5. Running around 70 I got as high as 14.5 but overall for the trip I averaged 12.9 on gas both highway and around town. Lots of idle time with the AC on.
I did a couple of tanks on E85 and got as high as 13 mpg running 70 mph but around town it was 11.5. Locally in Colorado running E85 mostly around town I get about 10.5
Same performance on both fuels but the higher altitude in Colorado at 6000' really saps power. Going down to low altitude in Texas it feels like a different truck.
Owners manual says to use 89 octane which we don't have in Colorado so I run 91 Around town at home I get roughly 11.5-12.5 mpg.
On trip I found 89 octane in Texas so I ran that, around town got around 12.5 mpg. On highway runs running 75-80 mph with AC on got up to 13.5. Running around 70 I got as high as 14.5 but overall for the trip I averaged 12.9 on gas both highway and around town. Lots of idle time with the AC on.
I did a couple of tanks on E85 and got as high as 13 mpg running 70 mph but around town it was 11.5. Locally in Colorado running E85 mostly around town I get about 10.5
Same performance on both fuels but the higher altitude in Colorado at 6000' really saps power. Going down to low altitude in Texas it feels like a different truck.
Cross-Country
Joined: Apr 2017
Posts: 83
Likes: 2
From: 9200' Colorado
I'm going to have to go read mine again! I think I saw it but advanced age brings other issues...lol.... Thanks for the heads up.
Follow up: I have no clue where I got the 89 octane from. Old age I guess. We only have 85/87/91 here so I'm good to go on the 87. Thanks again.
Posting Guru
Joined: Apr 2017
Posts: 1,655
Likes: 21
From: Western MA
So the owners manual is saying to use higher octane like 91 for best performance?
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Logistics Pro
Joined: Apr 2017
Posts: 3,924
Likes: 321
From: Lost in the Ozone....
I run 87 octane regular gas. Get 13.5mpg around town and now getting 17mpg highway at ~70mph now that the truck has a few more miles on her. I do know the non-10% Ethanol gas gets me better mpgs. In my area, 89 octane is 13% more and 91 octane is 22%. Not sure worth the money for just running around.
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Laughing Gas
Joined: Jul 2010
Posts: 859
Likes: 10
From: North Carolina
I have used E85 on numerous occasions to get through high priced states and the difference in mileage was no where near "dramatic". Full tank of 87 yields a DTE of 630-640, tank of E85 yields a DTE of 580-590. With the price difference (in my experience) being 50 cents or more per gallon, this more than makes up for the very minor drop in mileage or performance. Everybody's result may vary.
Senior User
Joined: Apr 2017
Posts: 326
Likes: 1
If you're towing 12,000lbs through the Blue Ridge Mountains and the old girl is huffin' and puffin' and the engine/transmission coolant temps are getting over 220 degrees -- You might experience some knock. If you do, your computer will retard the timing. Which will kill your fuel economy and cause you to lose some power. Maybe more than 'some'
But in everyday grocery-getting -- A lot of times, you'll get worse fuel economy running higher octane.
word
Logistics Pro
Joined: Apr 2000
Posts: 4,334
Likes: 306
From: Mills River
My interpretation is that Ford is saying that the engine meets spec per SAE J1349 conditions [ambient temp, pressure (elevation), humidity, etc.] when operating on 87 AKI fuel. However, if the engine is stressed and begins to heat up (i.e., high ambient temp, towing, etc.), then the ECM may (will?) retard ignition to minimize pinging / knock, which would reduce performance.
By using 91 AKI fuel to help resist ping / knock under these conditions and allow for optimal ignition timing, the lost performance should be restored.
I tried using 91 AKI fuel under non-stressed (and non-laboratory) conditions. My seat-of-the-pants-o-meter did not notice any improvement. However, I will try again later this year when towing a travel trailer through TX and NM.
HTH,
Jim / crewzer
By using 91 AKI fuel to help resist ping / knock under these conditions and allow for optimal ignition timing, the lost performance should be restored.
I tried using 91 AKI fuel under non-stressed (and non-laboratory) conditions. My seat-of-the-pants-o-meter did not notice any improvement. However, I will try again later this year when towing a travel trailer through TX and NM.
HTH,
Jim / crewzer
