+4 mpg - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 10-13-2009, 05:59 PM Thread Starter
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+4 mpg

i was talkin to a older guy at the fuel pump today and he was tellin me that the only thing he changed on his truck was switching to synethic oil and he picked up about 4 mpg around town and on the interstate. what do ya"ll think about this. i'm not sure i believe it makes that much difference. also are ther any cons to synethic oil?? thanks guys
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post #2 of 8 Old 10-13-2009, 06:01 PM
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subscribed. i dont think +4. maybe 1 to 2 tho.

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post #3 of 8 Old 10-13-2009, 06:06 PM
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Always run synthetic in these engines... +4, I doubt it.

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post #4 of 8 Old 10-13-2009, 06:10 PM
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that guy is smoking something. you can't get a 4mpg gain on an OBS without doing some other aftermarket stuff.

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post #5 of 8 Old 10-13-2009, 06:12 PM Thread Starter
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sounds like what i expected... to good to be true. just figured i'd ask. thanks
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post #6 of 8 Old 10-14-2009, 02:14 AM
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+4 by using synthetic, I doubt it. As said before, he's smokin something. I wouldn't even expect to see a 1 or 2 mpg gain. (though I'm not a believer in synthetic myself)

Now, gaining 2-4 mpg by using a fuel additive to replace the lost lubricity of ULSD, yes. I believe it.

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post #7 of 8 Old 10-14-2009, 12:19 PM
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Zip MPG add more likely just changing oils.
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post #8 of 8 Old 10-15-2009, 02:45 AM
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my mpg falls off with old / dirty oil so ho might have seen the improvement with fresh clean oil but not that much just because it was synthetic.

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