Sudden plunge to 11mpg - Ford Powerstroke Diesel Forum
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post #1 of 35 Old 04-04-2012, 01:44 PM Thread Starter
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Sudden plunge to 11mpg

Since new (a mere 2500 miles ago) the truck has been very consistent, just shy of 16mpg no matter what I was doing.

Just filled up today and it was 11mpg!!??!!

WTF? No real change in my driving habits. Truck is running fine.

All hand calculated. All fuel purchased from the same station.

Did my truck just get sick?

2012 F350, 6.7L Diesel, 4x4, SRW, Crew Cab, Short Box, Loaded, Ingot Silver
Detroit Truetrac, Icon leveling springs, steering damper mounts, King reservoir shocks and steering damper, Ultra Predator 22x10 and Nitto Terra 325/50R22 (35"s), H&S Minimaxx & Gearhead, aFe 5" SS w/ muffler, Leer XL, LineX, Titan 50gal, Airlift bags and wireless.
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post #2 of 35 Old 04-04-2012, 02:15 PM
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Could have had your first DPF regen, which murders your mileage.

Back to the blue oval: 08 F350 FX4 CCLB - DPF/EGR delete - Spartan tuner - S&B CAI - 4 in DP to 5 in SP

First truck: Early 99 F350 SC LB ZF6 4WD - SOLD

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post #3 of 35 Old 04-04-2012, 02:48 PM
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That would be my guess too. It will level off.

Mark

2011 F-350 4X4 Dually Lariat pulling a 2010 Sierra 355QBQ 5er -- Pic of Both



--- Sold - '01 F350, 8" lift, 38s --- Sold - '08 F-350 Leveled on 35s
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post #4 of 35 Old 04-04-2012, 05:03 PM Thread Starter
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what, a 285mile regen? even my total miles dropped significantly, it's been in the 350s prior!
Also, the lie-o-meter is also reading 11-12mpg

I think my truck is screwed, now to just find out why

2012 F350, 6.7L Diesel, 4x4, SRW, Crew Cab, Short Box, Loaded, Ingot Silver
Detroit Truetrac, Icon leveling springs, steering damper mounts, King reservoir shocks and steering damper, Ultra Predator 22x10 and Nitto Terra 325/50R22 (35"s), H&S Minimaxx & Gearhead, aFe 5" SS w/ muffler, Leer XL, LineX, Titan 50gal, Airlift bags and wireless.
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post #5 of 35 Old 04-04-2012, 06:05 PM
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And ford dealer won't do anything for that... Call them and give it another tank.

94% of all Dodge Cummins trucks from1992 through 2012 are still on the road today..... The other 6% made it home.....

2012 F250 Lariat FX4
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If it still runs when you delete it, you don't need it!
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post #6 of 35 Old 04-04-2012, 06:27 PM
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I have seen this too which seems to be the fuel as if i run anything but shell i see multiple exhaust cleaning filter notices which kills the mpgs. Dont know why, but if i run walmart fuel or something like it my mileage sucks. Dont get me wrong i always fuel up at high traffic diesel stations. Around here we have walmart and shell. Shell tends to be about a dime more. I've now been using the ford cetane boost in every tank since the last 1000 miles. My mileage in town ranges between 14.5 to 15.5 unloaded. Last week i had multiple loads of landscaping mult/dirt right at 1000lbs in the bed and that tank was just about 13mpg. The only times i see more than 15mpg is when i am unloaded and all highway. If i push it hard off the lights and drive it like my old 2500hd gas i too get 11mpg. Keeping the boost down is the only way to have decent mileage and run name brand fuel. Anyway just my findings.

My truck is a crew cab fx4 with 3.55 stock 20inch wheels and tires. 6200miles on the clock.
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post #7 of 35 Old 04-04-2012, 08:01 PM Thread Starter
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I fuel at the BP 1/4 mile from my house.

Not real happy about whatever is going on.

Truck seems to be running fine...?

2012 F350, 6.7L Diesel, 4x4, SRW, Crew Cab, Short Box, Loaded, Ingot Silver
Detroit Truetrac, Icon leveling springs, steering damper mounts, King reservoir shocks and steering damper, Ultra Predator 22x10 and Nitto Terra 325/50R22 (35"s), H&S Minimaxx & Gearhead, aFe 5" SS w/ muffler, Leer XL, LineX, Titan 50gal, Airlift bags and wireless.
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post #8 of 35 Old 04-04-2012, 08:56 PM
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is this your first DPF equipped truck?
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post #9 of 35 Old 04-05-2012, 04:19 AM
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If your regen is dropping you down that much then something is wrong IMO. Mine doesn't drop but maybe .5mpg during a regen.

2011 6.7 FX4 Lariat
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post #10 of 35 Old 04-05-2012, 05:25 AM Thread Starter
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Quote:
Originally Posted by drunk on diesel View Post
is this your first DPF equipped truck?
yes .

2012 F350, 6.7L Diesel, 4x4, SRW, Crew Cab, Short Box, Loaded, Ingot Silver
Detroit Truetrac, Icon leveling springs, steering damper mounts, King reservoir shocks and steering damper, Ultra Predator 22x10 and Nitto Terra 325/50R22 (35"s), H&S Minimaxx & Gearhead, aFe 5" SS w/ muffler, Leer XL, LineX, Titan 50gal, Airlift bags and wireless.
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