Hey guys. I’ve been on here quite a bit lately and read a lot about my problem already, just wondering if there’s any other in site.
I recently bought a 2012 Cascadia with DD15. Problem is it’s only getting about 3.75 MPG, average between loaded and empty miles which are 50/50 split. Here’s the specs.
-46,000 rears
-22.5 tires
-3.91 gears
-Eaton 18 speed
-550hp DD15
-46,500kg loads
It has been -40 Celsius here for the past week which is as long as I’ve ran the truck.
It has been doing the “rak rak rak” while
Idling so I’ve purchased a new fuel quantity valve. Do you think this will help the fuel mileage? Anything else I can try? Or is this just normal? TIA
2012 DD15 fuel mileage
Discussion in 'Freightliner Forum' started by Prairefarmer, Jan 19, 2020.
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You idle overnight? I'm assuming you are at those temps. Crappy fuel, moderately heavy loads, cold, bad mpg.
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That's what, 94,000#, and those short rears, plus blended fuel @ that temp ? What kind of mileage were you expecting?
But besides that, I'd check for boost leaks on that age truck. That will kill fuel mileage. -
Hammer166 Thanks this.
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Get that QCV changed. That will help for sure.
magoo68 Thanks this. -
You might be able to save alittle more letting your engine “dig alittle deeper” in your torque range. As the trucks get newer the power/ efficiency rpm band gets lower.
Other than that start with the basics. Check/replace fuel&air filters, check for lost boost (leaks). If all checks out get a good overhead run on it.
The overhead is the one thing left that a mechanic still has to have “a surgical” feel for.
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