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post #1 of 10 (permalink) Old 05-27-2010, 11:43 PM Thread Starter
 
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Higher Octane Gas.

My new job entitles me to a very good price on gas.With the 08 and newer 5.4 engines,can supreme gas be used without damage? 90 or higher octane

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post #2 of 10 (permalink) Old 05-27-2010, 11:52 PM
 
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No damage there Wayne..but probably no performance/mileage gain either..these trucks are designed to run on 87..To take advantage of the premium fuel, you need a tuner/programmer. They will bump up the timing and adjust the fuel mapping.

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post #3 of 10 (permalink) Old 05-28-2010, 12:19 AM
 
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like Glen said get a chip or a programmer



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post #4 of 10 (permalink) Old 05-28-2010, 12:29 AM
 
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i have ran 94 octane w 15/ethanol for years now. I got a constant 10mpg
i switched to shell Vpower 91 ocatane. gained almost 2mpg and truck feels way better.
100% city driving same route same time of day to test the MPG differences.



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post #5 of 10 (permalink) Old 05-28-2010, 03:09 AM
 
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Quote:
Originally Posted by BlairTruck View Post
i have ran 94 octane w 15/ethanol for years now. I got a constant 10mpg
i switched to shell Vpower 91 ocatane. gained almost 2mpg and truck feels way better.
100% city driving same route same time of day to test the MPG differences.
I'll bet that's because now you're getting 15% more gasoline by volume, instead of having it watered-down with ethanol.

And I'll bet they didn't even have the courtesy to give you a 15% discount on the gas that was cut with ethanol.

If they were drug dealers, someone would have shot them by now.

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post #6 of 10 (permalink) Old 05-28-2010, 07:22 AM
 
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Quote:
Originally Posted by BlairTruck View Post
i have ran 94 octane w 15/ethanol for years now. I got a constant 10mpg
i switched to shell Vpower 91 ocatane. gained almost 2mpg and truck feels way better.
100% city driving same route same time of day to test the MPG differences.

94 octane with the ethanol might equel out to 87 regular.... they sold ethanol mixed fuel here at the co-op's it was cheap but made your vehical run like ass most times








i had a tick in the 2000 5.4 i had i was running premium thought it was getting better fuel econ and milage but this ticking drove me nots it was on exceleration mostly took it to dealer under warrenty they told me prem was just a waste and the tick was the fuel system adjusting to the extra octane to get rid of it



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post #7 of 10 (permalink) Old 05-28-2010, 09:23 AM Thread Starter
 
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Regular it is then.

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post #8 of 10 (permalink) Old 05-28-2010, 08:40 PM
 
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i will not be running the 94 octane Husky gas anymore. It nice now casue only certain stations had it.



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post #9 of 10 (permalink) Old 05-28-2010, 09:07 PM
 
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94 octane burns much slower in the cylinder and there fore if the fuel mapping is designed for 87 then your wasting money. Some times you will find that the mileage
goes down and there is no power improvement.

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post #10 of 10 (permalink) Old 05-28-2010, 09:29 PM
 
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94 octane burns much slower in the cylinder and there fore if the fuel mapping is designed for 87 then your wasting money. Some times you will find that the mileage
goes down and there is no power improvement.
i was dyno tuned for 94 octane. premium minimum for Supercharged Harleys



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