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  #1  
Old 08-27-2013, 12:29 PM
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Default 93 Octane

I put a tank in because it was a good deal at Costco. My mileage dropped over 2 mpg. Can't wait to go back to midgrade (89). I called the dealership to ask if it was okay and they wouldn't recommend putting in 93 because the motor is not designed to burn that hot of gas. Now I know.
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Old 08-27-2013, 01:05 PM
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Higher octane is not "hotter" gas. Quite the opposite, actually. Not that it really matters.

All that really matters, is that the octane requirement of the motor is being met. If it isn't knocking or pinging, it's fine. Increasing octane beyond what the motor requires has no benefit.

At the elevation I live and recreate, I expect a new Hemi to thrive on 85 octane. Won't even try 87 unless the motor tells me it isn't happy with the 85. I can't forsee even the possibility of the Hemi needing 89, at this elevation.

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Old 08-27-2013, 01:22 PM
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I've been curious about using 85 - I also live at a higher elevation where our base octane is 85. The V6 fuel requirements say 87 and I've been wondering if I would need to put in mid-grade or if the 85 would work.
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Old 08-27-2013, 01:23 PM
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I can't even get 85 octane here. Might be moving to Utah soon though. My truck is running a stock tune still so if the thinner mountain air works ok with 85 octane I suppose that's what I will fill it with if its available in Salt Lake City.
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Old 08-27-2013, 02:00 PM
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Yup, as the others have said 93 octane will do absolutely nothing for you. It may seem like buying higher octane “premium” gas is like giving your car a treat, or boosting its performance. But take note: the recommended gasoline for most cars is regular octane. In fact, in most cases, using a higher octane gasoline than your owner's manual recommends offers absolutely no benefit. It won't make your car perform better, go faster, get better mileage, or run cleaner. Your best bet: listen to your owner's manual.
The only time you might need to switch to a higher octane level is if your car engine knocks when you use the recommended fuel. This happens to a small percentage of vehicles. Oh and it wont hurt your engine, nor your millage, you probably ran against a few head winds then your last tank or stepped on the gas a bit harder or ran into more red lights than usual, or traffic, Temperature change, age of gas and so on, all these things can determine what your truck average economy will be.
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