Help with poor mileage - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 08-14-2007, 08:01 PM Thread Starter
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Help with poor mileage

I have a 99 f250 and I can't seem to get any better than 15mpg. I have a MBRP 4" exhaust with the muffler, a DIY intake, and a hypertech chip on stage 2. The truck only has 102000 miles. I have been running the diesel additive you get at Tractor Supply (cant think of the name, but its in a wite bottle). I recently changed the fuel and oil filter along with an oil change. I cant figure this out. My overhead says 22.5 but I cant top 15mpg. Could my injectors be going? Truck runs great and seems to have plenty of power. Can someone help me with this?
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post #2 of 8 Old 08-14-2007, 08:24 PM
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How heavy is your foot?? I get 16-19 with my foot in it all week!
20-23 on trips I never mind the overhead.............it always seem to average 16.5 which I can't seem to figure unless that's what the factory plugged in?? Good Luck

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post #3 of 8 Old 08-14-2007, 08:57 PM
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I have the same truck with a 5inch exhuast and the DIY intake, I run with the edge and I get about 17 in fuel millage mode, thats with and without a heavy foot its about the same.



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post #4 of 8 Old 08-14-2007, 09:12 PM
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I get the same on my 01 250. Its pushing 220K but with the hypertech or now the VA chip its still 15 on a good day, if babyed 16... towing is 10. am hoping water meth will help a little...

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post #5 of 8 Old 08-15-2007, 03:33 AM
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part of the problem is the additive if you are using the white bottle its most likely Diesel Kleens winter additive. Get the gray one this time of year that will help. Also what rear end do you have

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post #6 of 8 Old 08-15-2007, 05:28 AM Thread Starter
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I have a 3.5 rear end. I use to use the grey bottle, but the last time I bought the additive they didn't have any. I will try that. I wonder if the hypertech has something to do with it? I don't really have a heavy foot, I do take off fast sometimes but not to often.
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post #7 of 8 Old 08-15-2007, 08:08 AM Thread Starter
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Just realized I didn't get this in the right forum, sorry guys.
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post #8 of 8 Old 08-15-2007, 08:18 AM
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thats no problem - just fill out your vehicle information or make a signature with that info and everyone will know what advise to give you based on your truck
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