Wondering what the rest of you Detroit guys are seeing for mileage out of your engines? I have a DDEC V that Leon has had his way with. 13 spd running through 3.42 rears on tall 22” rubber. I pull a stepdeck hauling transformers across all 48 states. I typically only run 58-60 mph. I’ve tried running in 12 @1400 rpm, and 11 @1550 rpm. Regardless, seems like I’m usually around 5.5 mpg. Any thoughts from you guys that have some experience? My C-16 Cat did quite a bit better than this engine has been doing. Kind of disappointed. Any thoughts would be great! Thanks, and stay safe drivers!
Mileage from a 14l
Discussion in 'Ask An Owner Operator' started by Short Pull, Jan 25, 2022.
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I believe detroit should be run with higher rpm ... I always ran mine at 1500 on flats
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Trucker61016 Thanks this.
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That seems very low for a Detroit, I'm averaging 6.5 to 6.8 running 1550 rpms at 72 mph. Did you get around to swapping in new injectors?
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Seems real low for a 14L. My 12.7 gets 6.25 lifetime with a hood and oversize.
I was initially scared of higher RPM, but they seem to like 1500 minimum .
I'm running 3:55 - 60mph in 12th at 1500, or 70mph in 13th at 1500.
Check CAC pressure test?DUNE-T Thanks this. -
I've had two 14L Detroit-equipped Centuries. Both were usually in the high-5's, maybe low-6's if you tried real hard. The fuel mileage was ok, I wasn't sad when I sold them for many other reasons. The sweet spot was about 1450 rpm.
Also had a 12.7 in a third one. Totally different animal. Would get close to 7 mpg anywhere. It was happier wound up about 100 rpm more than the 14L's. The problem was, being a Century, the rest of the truck was crumbling around a great engine.blairandgretchen Thanks this. -
blairandgretchen Thanks this.
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Diesel Dave, sealevel and blairandgretchen Thank this.
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