I think I have had enough with this truck.
2013 Pete 386 with 3.73 rears 455hp.
The truck is so #### on fuel!!! I baby this thing and struggle to keep 6mpg. How are these guys getting 7 to 8 so easily?
I had a top end set done
What was found
"All valves were tight"
" 2 were just sitting there loose"
Turbo pressure sensor
Checked air to air everything is good.
My mechanic said I should see 7 easy but still nothing been 2k miles. Is there a mileage period where the truck needs to drive after the work that has been done?
What else can I try?
Paccar MX13 Fuel Mileage, how can I get to 7mpg?
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by steve092, Nov 10, 2018.
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An overhead should have an immediate improvement it that was the problem. Other than suggesting some after-treatment issues or plugging. I don’t know any thing about the MX13.
Only other suggestions would be to look toward an alignment issue with the truck or trailer...PE_T Thanks this. -
Needs a different file in it. Werent you having a bunch of other issues related to the improper programming?
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The paccar in my 579 is very efficient upper 7s low 8s fully loaded. Truck seems happy at 1150 to 1250 for rpms with the pacar 12 speed that puts me between 65 and 72 mph. 68 is about the best cruise speed
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I drive a 16 Pete 579 and am averaging 6.8 mpg pulling a 48' split axel curtain side up and down interstate 5 thru WA,OR,CA. I set my cruise for 58 in CA and 60 everywhere else. Usually in the 75k - 80k gvw. What speeds are you normally driving and where is your normal running areas? I can usually pull out a .5 mpg extra if I don't use the cruise control and keep the boost under 20psi.
D.Tibbitt Thanks this. -
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This was California driving I 15 i40 running 55 the whole way till I got in traffic. Took pic when I seen it an we were going slow. Load was about 15,000 not heavy but still impressive numbers.
D.Tibbitt Thanks this. -
Ride the hills, don’t use cruise control until you’re at cruising speed and accelerate with up to half throttle. I usually get 7-7.2 mpg taking I-70 from Kansas to Ohio and I haul beef loads which are always as heavy as legally possible. I drive nights also which help avoiding all the traffic and sudden stops when passing thru big cities.
D.Tibbitt Thanks this. -
Make sure your using oem only filters. Keep your egr/aft system clean. Make sure engine,can softwares up to date. You heard of an mx special ?
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