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"Slap hands slap hands"
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Just put a set of 33x12.5 MT with 22 wheels it lowered my mileage a bit. Drove to LA and back last week and got 14.7mpg was getting close to 15.5-16 with my toyo ATs. Using archoil9100 and Lucas fuel treatment. New tires didn't affect my towing mpg Hardly at all that stayed right at 12-12.5.
 

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114 Posts
ID street tune, 5 inch exhaust,s$b air intake,35's,6 inch lift CC_LONGBED. 4X4 if I keep it 70mph it will get 17 mpg. Averaging about 15 though.
 

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I'm sorry to cut into this thread. I am new to this site and haven't
figured out how to start a new thread. I have a 2003 f350 6.0 that is having idling problems. FICM is 48 volts,IPR 25 at idle,ICP 671 at idle.
Usually the delta when towing is 9. The truck has 225,000 on it. If any
member could steer me in the right direction I would really appreciate it. thank you
 

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EA - Eggfarts Anonymous!
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18,815 Posts
I'm sorry to cut into this thread. I am new to this site and haven't
figured out how to start a new thread. I have a 2003 f350 6.0 that is having idling problems. FICM is 48 volts,IPR 25 at idle,ICP 671 at idle.
Usually the delta when towing is 9. The truck has 225,000 on it. If any
member could steer me in the right direction I would really appreciate it. thank you
welcome! FYI if you go to the 'Forums section & look up the '6.0 Technical Info' & click on it, then look for the 'New Thred' button, that's how to start a new thread (at least on the desktop version of the site).
OR click on this & look for the 'New' Thread button: 6.0L Power Stroke Technical Info - PowerStrokeNation : Ford Powerstroke Diesel Forum
OR see if this link works... might not, but worth a try (this is the link in the 'New Thread' button): PowerStrokeNation : Ford Powerstroke Diesel Forum - Post New Thread

otherwise, your IPR% is 25%at idle? i would have to confirm, but that sounds just the tiniest bit high... but please confirm that. else, if it only gives trouble when it's cold, i'd think it's an injector or two sticking. you could always check around the ficm harness, they can rub the insulation off & give these symptoms... the list goes on & on. I hope the right guy on here knows what to tell you! best of luck!
 

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2006 Ford F350 King Ranch
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33 Posts
before i through the 33s on my truck i was getting any where from 18-25 mpg. i actually was getting good mileage. i would fill the tank up full and have about 605 miles until empty now with the tires i get around 16-18mpg. im assuming upgrading my injectors and fuel pump will restore some of that. since the fuel will be more consistent. Nice truck btw mine looks damn similar to yours.
 

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Just another old guy...
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45 Posts
Recently bought a 2006 F250 Lariat, 2x4, studded, EGR-delete, 4" exhaust, Air Raid intake, 115k miles.

Started with the first tank at just a hair under 16 mpg, running 75 mph on the highway. After changing oil, oil filter, and fuel filters have has seen it drop down to mid-13s... :/
 

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44 Posts
The best I have gotten is 18mpg but that’s an imperial gallon, 4.54 imp vs 3.83 us, which works out to be 15 mpg us
 

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2005 Lariat Crew short bed, stock with STC canned tune, blue spring, 305/65R18 BFG Discovery, made 4 trips from Southern Michigan (Jackson) to the Upper Peninsula (Marquette), about 450 miles each way. Each trip on a single tank of fuel most of the way at 78mph using cruise, with real world calculations averaged 16.5.

First time driving up I took my time, drove manually(no cruise) just at or below speed limits, no stops at all, between 70 and 75mph, averaged 17.5mpg real world calculation.

I did use the dash calculator as well, and over all for the whole trip it averaged out the same or pretty close. But with that I could see what speeds really negatively affected the averages. The truck really seems to like 65 to 70 mph better than 75 to 80... From about mid Michigan to the south the speed limit is 65 and 70mph. You get above St. John's, and it's pretty much 75mph all the way past the bridge then 65 and 70 again on the smaller highways past St Ignace. I could get a good idea of what speeds boost the over all average and what killed it this way.

Sent from my SM-G955U using Tapatalk
 

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Moderator
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1,097 Posts
16.5 is about par for a 6.0 with an automatic and 305 tires.

I suggest you read the stickies.
 

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EA - Eggfarts Anonymous!
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18,815 Posts
i'm getting 16-17 highway currently with 285 width ATs in my auto 2wd 6.0 going 70mph :p
I'm kinda looking forward to getting a set of stock highway treads again. i miss 20 mpg and that smooth quiet ride!
 

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i'm getting 16-17 highway currently with 285 width ATs in my auto 2wd 6.0 going 70mph :p
I'm kinda looking forward to getting a set of stock highway treads again. i miss 20 mpg and that smooth quiet ride!
This is what drives me nuts. You're getting 16-17 going 70 with a 2wd truck. Your truck is lighter than my Ex, you have less parasitic drag with 2wd vs my 4wd, and you drive typically 10-15 MPH slower than I do. I have 285s as well....in 75-R18 flavor. 16-17 is my average, with both city and hwy factored in. When I'm doing strictly highway I get 18 usually, unless I drop my speed down to 75, and then I'm almost to 19. (these are all summer figures, of course) I just hate how inconsistent our mileages are. I realize there are a lot of variables, but it's crazy to see how wide a range we end up with.
 
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