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  #1  
Old 05-05-2011, 04:24 PM
belle belle is offline
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Default A Surprise GAS Discovery... I think?

I've been using 89 octane as recommended in my 2011 Ram manual and gas mileage and performance have been good. Yesterday, I had to get gas for my lawn equipment which all use 87 octane. After I filled my containers, I figured I might as well top off the truck. Since I was already using the 87, I put about 4 gallons of the 87 in the truck tank. To my surprise, my truck's performance and sound have improved significantly. The mpg has stayed about the same, but the truck's, get up and go, has amazed me. Is this a coincidence or would such a mixture improve performance?
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Old 05-05-2011, 04:38 PM
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I have used 87 octane once or twice when i was at a place where they only had regular & diesel fuel.
I didn't quite get the same readout mileage, but i did not take into consideration any wind conditions, etc.
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Old 05-05-2011, 06:06 PM
huntergreen huntergreen is offline
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Quote:
Originally Posted by belle View Post
I've been using 89 octane as recommended in my 2011 Ram manual and gas mileage and performance have been good. Yesterday, I had to get gas for my lawn equipment which all use 87 octane. After I filled my containers, I figured I might as well top off the truck. Since I was already using the 87, I put about 4 gallons of the 87 in the truck tank. To my surprise, my truck's performance and sound have improved significantly. The mpg has stayed about the same, but the truck's, get up and go, has amazed me. Is this a coincidence or would such a mixture improve performance?
i am no expert, but i don't think 4 gallons of 87 added to the 21 gallons of 89 octane would change things that much. as i said, i'm no expert though.
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Old 05-05-2011, 06:15 PM
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I'm certainly no expert either, but I've run about 4 tanks now. I tried only one with 89, and the rest were 87, and I can't tell the difference. Truck seems to run awesome on either, so why pay the extra. Keep in mind that air temp and moisture content can make a big difference on performance perception, at least from my eperience with lots of other vehicles.
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Old 05-05-2011, 07:16 PM
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Been running 87 since the get go. No problems. Got wicked mpg's on my first roadtrip this past weekend. I guess the computer is learning the driving habits or whatever.
All I know is, I'm getting double the fuel economy I had with my '97 Ford Explorer, so even though compared to a Toyota this beast is a gas-guzzler, compared to my previous ride, it's a grand slam out of the park. Win-Win.
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Old 05-05-2011, 08:07 PM
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Well I just noticed the opposite. I was using 89 exclusively since new however the tank before the last one I filled up from 1/4 with 87 because 89 was going for $1.50 liter. To my surprise performance went way down and the truck just did not have the get up and go that it use to have. So the last tank I put 89 back in and guess what, my RAM is back to her old self, wicked fast. So I can definitely tell the difference. Perhaps the computer learns and optimises on what is being used. Anyway looks like expensive gas for me, I really don't care cause it makes it fast.
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Old 05-05-2011, 08:19 PM
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It could be the difference with an ethanol addative in the 89. I know that's whats normally cheaper here, but then again, SD produces a ton of ethanol. The cheapest here is 10% ethanol, 89 octane. The 87 is normally more expensive but has no ethanol in it. I know my 15 year old car normally gets better mileage with the 87 (no ethanol) but I don't think it matters to much in my truck.
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Old 05-05-2011, 08:43 PM
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Good for you!!!

My truck refuses to run on 87, it doesn't like 89 that much and so it gets 92.
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Old 05-05-2011, 09:28 PM
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well here in "great" state of Utards....I dunno about off base, but on base they only offer 85, 87, 91....well....for the longest time I ran 85 with no problems what so ever....but since getting the cai, exhaust and DSP, I've been running the 87 tune and 87 octane, can't really tell about the mpgs since I live on base and don't really do a lot of interstate traveling (wifes charger is for that).
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Old 05-06-2011, 12:30 AM
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I've been running 87 since I bought the truck. From what I have seem in the 4th gen there isn't much or any improvement in terms of performance. Now I am no expert but I do have a Science degree and I teach science for a living 89 as rated in terms of octane is not going to give you a performance boost. The major difference is in terms of Octane will be the combustion process and the level of impurities that remain after combustion. 89 will be slightly more clean burning and reduce the overall deposit of carbon. Over the lifetime of the truck the difference in carbon build up will probably be minimal.

87 vs 91 is another story, but you have to worry about the fact that 91 one also combusts at a higher temperature which is why the amount of carbon deposit is so small and performance is much greater. Some people may notice a performance boost between changing fuels but 87 vs 89 will not be much different, price will be the ultimate factor.

I once poured 87 into my Suzuki GSXR1000 when I ran out of gas. The thing felt like riding a lawnmower it was slow and clunky. 91 was what it was designed for and well worth it.
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