Fuel mileage going down - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 09-26-2008, 07:44 AM Thread Starter
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Fuel mileage going down

I've been running a mileage check on my 06 PSD 4X4 Crew Cab since July to and from work; the check started when I finally got to 26K miles. I use the same route and same driving habits (light throttle keeping the boost under 10 lbs) for a 100 miles . First check was 17 mpg. I changed t-case, front and read diffs to synthetic and next check it went to 18 mpg. The last 4 checks it's down to 15 mpg! WTF is going on? Is ULSD the culprit? Has someone (the dang government or the fuel industry) changed the formulation for D2?

It seems we Americans are trying to get better economy and the government and industry are working against us. Can anyone tell me what is going on and how I can gain back some mileage? The vehicle is stock.

Thanks,
Richard
Huntsville, AL

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post #2 of 6 Old 09-26-2008, 08:11 AM
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sounds like your over due for some fuel filters!
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post #3 of 6 Old 09-26-2008, 08:23 AM Thread Starter
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Fuel filters?

I have changed both filters not long ago (forgot mileage) after getting a "Water in Fuel" warning light. I have a Vormax filter I'm planning on putting between the tank and the HFCM soon, but what would explain the sudden loss of mileage?

Richard

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ARP Bolts
Mildly shaved heads
Elite Sneaky Up-pipe
SCT X3 Tunes by ID
MagnaFlow Exhaust
XDP Coolant Filter
Bilstein 5100 series shocks
Stock suspension w/ leveling kit
Transfer flow 42 gallon tank
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post #4 of 6 Old 09-26-2008, 11:05 AM
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I would say fuel filters as well...recommended 10k change interval. Have you been using the same fuel station to fill-up?

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post #5 of 6 Old 09-26-2008, 12:16 PM Thread Starter
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Fuel Mileage

Same station, same pump and same fill-up technique; let it run until it clicks off by itself-no squeezing more in. I'll change filters this weekend and check again, but I'm still wondering.

Tellicorick
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2006 PSD, CC, FX4, Lariat

Bullet Proof Diesel Full Mod
ARP Bolts
Mildly shaved heads
Elite Sneaky Up-pipe
SCT X3 Tunes by ID
MagnaFlow Exhaust
XDP Coolant Filter
Bilstein 5100 series shocks
Stock suspension w/ leveling kit
Transfer flow 42 gallon tank
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post #6 of 6 Old 09-26-2008, 02:56 PM
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I get some MPG drop if I don't run the grey bottle of Diesel Kleen, and if the oil needs changed, or if the fuel filters are getting dirty. Check the air in your tires weekly. I run the front at 70 and the rear at 65. chalked Wear pattern is perfect. It's in the details. Look into running 10w-30 CJ-4/SM oil (do your own research on this topic). I've noticed different stations have different smelling/feeling fuel; not sure if it's important or not.

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Last edited by JBakerFX4; 09-26-2008 at 03:00 PM.
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