10 mpg winter fuel??? any one else - Ford Powerstroke Diesel Forum
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post #1 of 23 Old 12-22-2011, 04:33 PM Thread Starter
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10 mpg winter fuel??? any one else

i use to get about 14 mpg around town in the summer now in the winter im getting about 10ish. i also just put on 33in mud tires in the summer i had stock size ats. any one else getting 10 mpg in the winter. im thinking about changing the air filter and fuel filter???

Early 99 201,000 miles. Extra spring up front leveled, 4 in turbo back to 6 in tip, 6637, glow shift gauges, dp tuner, kicker speakers, alpine head unit and amp, kicker sub, extang tonneau, bedliner bumpers grill, flares, and rockers, 33in toyo mt, 18in xd monsters, 05 Harley lights, recon tails and line of fire, 20% tint

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post #2 of 23 Old 12-22-2011, 05:46 PM
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You have a lot of factors to look at. Filters are a good start. The larger tire will not help plus it will throw the speedometer and odometer off which in turn gives you a false MPG reading. 4MPG is a bit extreme for #1 but 1-3 MPG is not unheard of when switching from #2 to #1.

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post #3 of 23 Old 12-22-2011, 05:52 PM
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Ive noticed i've lost about 2mpg since we started getting colder weather.. Although I do not know if they've actually switched to winter fuel here in south Texas yet.

Uhhh... Wait... What...

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post #4 of 23 Old 12-22-2011, 05:53 PM
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Are you calculating the difference in tire size?

Zach
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post #5 of 23 Old 12-22-2011, 05:58 PM Thread Starter
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no im not how would i go about doing this. the truck runs geat i dont think its any injector issuses starts right up in the cold

Early 99 201,000 miles. Extra spring up front leveled, 4 in turbo back to 6 in tip, 6637, glow shift gauges, dp tuner, kicker speakers, alpine head unit and amp, kicker sub, extang tonneau, bedliner bumpers grill, flares, and rockers, 33in toyo mt, 18in xd monsters, 05 Harley lights, recon tails and line of fire, 20% tint

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post #6 of 23 Old 12-22-2011, 06:00 PM
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Normal to get lower fuel economy with winter diesel that's why a lot of big rigs have tank heaters and heated fuel lines so they can keep using summer diesel a lot longer.

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post #7 of 23 Old 12-22-2011, 06:08 PM
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Quote:
Originally Posted by zrain25 View Post
no im not how would i go about doing this. the truck runs geat i dont think its any injector issuses starts right up in the cold
You need to figure out the % difference in tire size...

Tire size calculator

Then, whatever the difference is, add that % to your miles driven. And make sure you fill the tank up all the way.

Zach
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post #8 of 23 Old 12-22-2011, 06:14 PM Thread Starter
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im not good at this math stuff im sure if i tried hard enough i would get it but... it says is 3.7% slow

Early 99 201,000 miles. Extra spring up front leveled, 4 in turbo back to 6 in tip, 6637, glow shift gauges, dp tuner, kicker speakers, alpine head unit and amp, kicker sub, extang tonneau, bedliner bumpers grill, flares, and rockers, 33in toyo mt, 18in xd monsters, 05 Harley lights, recon tails and line of fire, 20% tint

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post #9 of 23 Old 12-22-2011, 06:16 PM Thread Starter
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im going to start useing the gps for my miles

Early 99 201,000 miles. Extra spring up front leveled, 4 in turbo back to 6 in tip, 6637, glow shift gauges, dp tuner, kicker speakers, alpine head unit and amp, kicker sub, extang tonneau, bedliner bumpers grill, flares, and rockers, 33in toyo mt, 18in xd monsters, 05 Harley lights, recon tails and line of fire, 20% tint

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post #10 of 23 Old 12-22-2011, 06:25 PM
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you also let it warm up more and idle more when its cold out. when youre sittin still and the engine is runnin youre gettin 0 miles per gallon
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