Can this be right for MPG? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 01-24-2009, 06:44 PM Thread Starter
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Can this be right for MPG?

I just got my SCT with X street. I drove from Tifton to Jacksonville Fl. Its pretty much a straight shot. had the truck on cruise the entire time. My gauge read about 16 mpg the entire trip. That just seems a little low. I know that i had some updates from ford a while back and noticed a steady decline in MPG. Well, i calculated it when I got back, tell me if I'm wrong, 400 miles and used about 23-25 gal. thats 17.3 MPG right? why is the computer off so bad? I got alot better before the updates.

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Last edited by rjwareagle; 01-24-2009 at 06:52 PM.
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post #2 of 11 Old 01-24-2009, 06:52 PM
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I don't know why your computer would be off so far. The 35's are close to 15% larger than stock so there is a margin of error tight there, but it wouldn't make that much difference.

I would be happy with 16mpg, only time I have seen 20+mpg is with my Taurus(SHO baby). Hand calculated the best I have seen is roughly 13mpg. I do run a lot of boost at highway speeds, well it seems like a lot to me. 70-75mph I am running atleast 13-20lbs of boost.

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post #3 of 11 Old 01-24-2009, 06:57 PM Thread Starter
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ok, our trucks are almost the same. I dont know if the reading before the updates were wrong and now they are right after? ford couldnt really tell me. they thought that the MPG might increase. well, If thats about normal im happy. Just checking though.

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post #4 of 11 Old 01-24-2009, 06:58 PM Thread Starter
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which innovative tune do you run? which has been the best for you? (MPG)

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post #5 of 11 Old 01-25-2009, 06:20 AM
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rj, next time fill to a -steady- visual level in the neck and check the same way-its the only accurate way. I always get 5-6 gallons more in AFTER the pump first cuts off, down South we have no problem getting 16mpg, in an E450 rv-but I do keep the revs at about 2,000 - 2,200.

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post #6 of 11 Old 01-25-2009, 06:59 AM
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I am on 35s and I usually get 14mpg per computer stock. so 15% means I am getting 16mpg stock right? Nice!

My wife drives the truck more than I do due to our jobs, but I will try to manually check it... Should I add 15% to miles driven due to the tires??
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post #7 of 11 Old 01-25-2009, 07:57 AM
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I run Extreme Street, and a I will admit that I do have a heavy foot. I know city driving will kill my mileage so I am not too worried about that, but the highway trips are another matter. I try to keep my rpms below 2000 as I have been told that is the magic number but it seems no matter how I drive and where I keep the rpms I get the same mpg within 1 or 2.

As for the hand calculations, yes you add 15% to the total miles driven for the tank you are checking. Assuming you havent had your speedo corrected with a tru speed type product.

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post #8 of 11 Old 01-25-2009, 08:14 AM Thread Starter
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that's what I am running. I guess I will be happy with my MPG numbers. I like the x street, seems to have good pick up, but once i get on it it moves pretty good. MPG in town are not as good, but i try to be easy with it. one quick off topic question, in the morning it seems to be idled up a little, then after I drive and get it warm it seems normal, happened to you?

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post #9 of 11 Old 01-25-2009, 08:18 AM
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Yah it seems to idle a little bit higher when it is cold, before it goes to the factory high idle. I am tempted to not run the extreme street in this cold but my aggressive tow tune is worse mpg and has a harder time starting in -30. Still havent tried the extreme race, but I hope to try it out when the ice melts.

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post #10 of 11 Old 01-25-2009, 08:26 AM Thread Starter
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Sounds good. thanks man!!!!

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