In My Experience 89 Octane Gets Better Gas Mileage

MyRAMatDunkinDonuts · Apr 13, 2017

As you may know, I got my first RAM back in late December, and I was wondering why I couldn't get past about 12.5MPG city driving. Then, when I came on this board, I discovered the recommended octane is 89. Switched to 89 sometime in February, and absolutely same type of driving, and I've been at 14.5MPG ever since.

...just wanted to share that.

69GWC · Apr 13, 2017

Thats pretty much what I get running 89 in mine.

Rzrman328 · Apr 13, 2017

I wish I could get 12.5 consistently

jljbtm · Apr 13, 2017

I'll try it every little bit helps

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reddevil78 · Apr 13, 2017

I'm getting 13-14.5 on a 89 HF tune depending how hard I am on it. Running 35-12.50-20 on stock rims with toyo M/T

MyRAMatDunkinDonuts · Apr 13, 2017

I guess I should clarify my truck is bone stock.

Exhausted · Apr 13, 2017

I get 16 and always use 89. I recently changed my oil and used 5w-30 instead of 5w-20 and my mileage went down to 15.5-15.7 in town

Csanders1992 · Apr 13, 2017

MyRAMatDunkinDonuts said:
As you may know, I got my first RAM back in late December, and I was wondering why I couldn't get past about 12.5MPG city driving. Then, when I came on this board, I discovered the recommended octane is 89. Switched to 89 sometime in February, and absolutely same type of driving, and I've been at 14.5MPG ever since.

...just wanted to share that.

How many miles were on your truck when you bought it? Engines are typically much more efficient after they are broke it. I saw the best fuel economy out of my 2015 5.7 after the first 3-5k miles

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GreenClassic · Apr 13, 2017

I use 89. My fuel mileage didn't improve until I had over 10,000 miles on it. I could barely get 12mpg before. Now I get around 14mpg in town.

My first road trip, which started with the truck having less than 100 miles on it, I averaged 18mpg highway around 70-75mph. That road trip was about 1000 miles total.

My road trip these past 2 weeks (started with about 15,000 miles on the truck). I averaged about 20mpg going 75-80mph. 3750 miles total.

MyRAMatDunkinDonuts · Apr 14, 2017

Csanders1992 said:
How many miles were on your truck when you bought it? Engines are typically much more efficient after they are broke it. I saw the best fuel economy out of my 2015 5.7 after the first 3-5k miles

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14.9k, and now at 19.1k

Jwithing · Apr 14, 2017

14.8mpg w/ vararam, 93 Diablo tune, 37x13.5x20, 6 I checked lift, 8spd, 4x4, 3.92. Mostly flying down the highway at 80mph... Happy with what I'm getting lol

BossHogg · Apr 14, 2017

MyRAMatDunkinDonuts said:
As you may know, I got my first RAM back in late December, and I was wondering why I couldn't get past about 12.5MPG city driving. Then, when I came on this board, I discovered the recommended octane is 89. Switched to 89 sometime in February, and absolutely same type of driving, and I've been at 14.5MPG ever since.

...just wanted to share that.

I call BULL! Two miles a gallon increase, no way, no how. Octane does not contain any heat energy, not a drop.

Your switch to 89 octane may have aligned with the switch from winter to summer blended fuel which does contain more heat energy, I experience about 1.5 MPG increase but not two miles a gallon more.

69GWC · Apr 14, 2017

BossHogg said:
I call BULL! Two miles a gallon increase, no way, no how. Octane does not contain any heat energy, not a drop.

Your switch to 89 octane may have aligned with the switch from winter to summer blended fuel which does contain more heat energy, I experience about 1.5 MPG increase but not two miles a gallon more.

Its bull if he got 2mpg better but yet you say you got 1 5mpg better..lol

sladekos · Apr 14, 2017

Yikes! I am pretty much consistently 18 mpg. I have about 11k on the truck. Probably 80% highway miles.

I don't know how to post my fuelly.com information, but I just looked it up and my average mpg is 18.1.

I don't have a lead foot and I rarely drive more than 4 over the posted speed limit. Unless I am texting, then I am all over the place.

MyRAMatDunkinDonuts · Apr 14, 2017

BossHogg said:
I call BULL! Two miles a gallon increase, no way, no how. Octane does not contain any heat energy, not a drop.

Your switch to 89 octane may have aligned with the switch from winter to summer blended fuel which does contain more heat energy, I experience about 1.5 MPG increase but not two miles a gallon more.

Not sure what to tell you...

...and for the most part, I use the same gas station, QT.

huntergreen · Apr 14, 2017

I have been getting 16.1 mpg hand calc using shell gas with 87 octane.

barr0208 · Apr 14, 2017

16 mpg heavy foot

bretttn · Apr 14, 2017

Gas mileage comparisons crack me up. Too many variables to truly compare to get bent out of shape on who gets what. Don't get me wrong, I like getting half decent mileage but I didn't buy a Prius I bought a truck

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MyRAMatDunkinDonuts · Apr 14, 2017

Oh, I don't really care about gas mileage inasmuch as I care for having some sort of relatively constant baseline to let me know if something is going wrong.

Jwithing · Apr 14, 2017

bretttn said:
Gas mileage comparisons crack me up. Too many variables to truly compare to get bent out of shape on who gets what. Don't get me wrong, I like getting half decent mileage but I didn't buy a Prius I bought a truck

Sent from my XT1585 using Tapatalk

Hey, I would love to buy a Prius... So I could park a 37 on the hood :naughty:

In My Experience 89 Octane Gets Better Gas Mileage

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