Driving me nuts

[Nosparkplugs]

In the last 6 months or so my milage has dropped from the usual 17is down to 10 to 12. I have checked everything including: injectors, brake calipers, tire pressure, and everything else i could think of or NCHornet advised me to do. Nothing has seemed to help so any advice would be aboslutely awesome. As the title says this is driving me nuts. And this is not just a winter milage loss as it happened before the fuel would have been blended.

[Rob]

Air filter, fuel filter(s) heavy foot?

[JakeLewis79]

Winter fuel, excessive warm up time, ebpv, and driving in 4x4 (or just leaving hubs locked) all kill fuel mileage. I've gone from about 19-20 summer to around 15 in the winter. Sticky parking brake? TC going bad? Good luck and keep us updated.

[Nosparkplugs]

Filters are changed regularly. This started before winter blends, warm ups, 4x4 etc and has actually only gotten slightly worse since then. ebpv operates normally. keep them comin guys

[JakeLewis79]

Is there a puddle of fuel in the engine valley? Or a puddle of diesel on the concrete under the truck anywhere?

[Nosparkplugs]

No none that i have noticed and i recently changed the drain behind the filter.

[JakeLewis79]

I'm running out of ideas.

[INTERNATIONAL7.3]

check all your intake boots, if any sign of wear/tear.. replace all your silicone boots and clamps

[Strokeorcroak]

a TC going bad can cause low mileage?

[Nosparkplugs]

Boots were changed about a month ago when i put new o-rings under the turbo. If i dont solve this soon the truck might have to go to the dealer for the first time in 5 years. This low milage is absolutely terrible. Any other ideas are greatly appreciated.