2014 T660 13speed EF.
I'm getting about 5.5 loaded @40000
Running anywhere from 65-80.
Would running @ 63 in "12 direct" (Guessing on knob would show 8L)
Be best for fuel mileage?
13 Speed Fuel Mileage
Discussion in 'Experienced Truckers' Advice' started by TigerShark, Feb 20, 2017.
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You're joking, right? You're serious? ... 65-80? Oh dear.
No, running in 12 is not going to help your mileage in that case. I heard a wild rumor one time years ago that running slower (55-65mph), improved range and reduced fuel costs considerable versus running 75 and 80 mph.
I get 7.2-7.4 doing 65mph, always at least 70k-80k and running 48 states and a lot of northwest. No, I'm not passing everyone on the road and I realize that may be a problem for some. For those, they are going to have to decide where their priorities are ... Passing lots of trucks or passing lots of fuel pumps. You simply can't have it both ways. Sorry.Last edited: Feb 20, 2017
mitmaks, QuietStorm, Crude Truckin' and 5 others Thank this. -
6.7 - 7.0 fully loaded @ 65...or really 64.8mph 2016 freightliner Cascadia auto.
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If I get a string of lighter loads ( under 30k ) I can easily average 7.8 at 65
To see any benefit from dropping it to 12 I'd have to run 55-57TigerShark Thanks this. -
Lepton1 Thanks this.
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Their is never any fuel economy benefit to running a gear down. OP is mistaking the transmission efficiency loss associated with OD vs direct drive gear, with truck efficiency. Transmission efficiency is just part of the equation:A very small part. You wan't better over all efficiency you need to spec the truck differently.
Keep in mind: Less speed will always increase efficiency. And when your talking fuel efficiency numbers always consider the source. A lot of fools trust the lie-a-lot-meter built into their truck. Numbers in the real world are always much lower. Much more like yours already.BoxCarKidd, Heritage11 and TigerShark Thank this. -
Thanks that's all I was wondering.
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Actual to the tank numbers in mine are .6 lower than what the box says cumulative avg over the life of the truck so far. If I listened to the dummy in the box she thinks I'm almost always over 8 lolLast edited: Feb 20, 2017
Toomanybikes Thanks this. -
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65 - 80 mph?
Most anything above 68 - 69 and mpg drops off exponentially.
When loaded,.. I personally cruise between 63 - 65 mph,.. I dont care if the speed limit is 75 or 80.
HurstRazorbackdave and cke Thank this.
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