Join Date: May 2007
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I thought I was getting only around 7-8 per Canadian gallon until I read a couple of days ago that the filler kicks off about 6 gallons short of a full tank. I tried the slow fill and got a heck of a lot more fuel. Which so far is on a par with around 13 mpg which makes me feel a lot better.Guess I should have been paying better attention.
This is one of Fords TSB's regarding fuel economy.
6.0/6.4 Fuel Economy:
Ford vehicles equiped with the 6.4 PowerStroke diesel are not rated for fuel economy by the EPA. If economy is in question, a boost test should be performed. If boost reaches 22-25 PSI in third gear, wide open throttle under load, then the engines operating normally and no economy related repairs need to be performed. If not in specs, then the engine will need to be diagnosed--check sensor reading, VGT and EGR operation, fuel pressure and quality, crankcase pressure, intake or exhaust restriction, exhaust or CAC leaks.
Fuel economy will be affected by many factors, including: excessive idle time (one hour equals approxmately 33 miles of driving), fuel quality and blend, ambient temperature, driving habits, vehicle use, towing, loads, add-on accessories. Broadcast Message 1271, 4450, 6989
I tried this and mine appears to be working fine. I have just under 6000 miles on my truck. I definitely noticed an improvement as I got a few more miles on the engine. Hope this helps.