2012 6.7L, 3.55 FIRST MPG CHECK - Diesel Forum - TheDieselStop.com
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6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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Old 01-06-2012, 08:01 AM   #1 (permalink)
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2012 6.7L, 3.55 FIRST MPG CHECK

Just filled up my tank at a little below half. Mix of 50/50 highway and around town, plus sat for a 1 1/2 hours at hockey practice idling on and off to stay warm. Got 14.05 figuring it the old fashion way not the computer. It 's way better than my 08 6.4, that would have probably been a 9 MPG cause of the idling.
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Old 01-06-2012, 03:01 PM   #2 (permalink)
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my first few fillups were summer mix. I got 18. Now on winter mix 16, no idling mixed driving. crew cab 8' bed 250
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Old 01-06-2012, 05:23 PM   #3 (permalink)
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Mixed I'm around 16.5-17. Highway is 18.5-19.
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Old 01-06-2012, 08:11 PM   #4 (permalink)
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Same as above with 3.73's.
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Old 01-07-2012, 04:30 AM   #5 (permalink)
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why idle?

why do diesel engine owners sit around and idle thier trucks? you know when its sitting there idling its getting 0 mpg. try turning off the engine, its not going to hurt it to restart it.
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Just filled up my tank at a little below half. Mix of 50/50 highway and around town, plus sat for a 1 1/2 hours at hockey practice idling on and off to stay warm. Got 14.05 figuring it the old fashion way not the computer. It 's way better than my 08 6.4, that would have probably been a 9 MPG cause of the idling.
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Old 01-07-2012, 06:25 AM   #6 (permalink)
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I am seeing 16.5 with mine combined. about a 70 - 30 freeway city mix. 3.55 gears in the rear end.

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Old 01-07-2012, 07:00 AM   #7 (permalink)
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I've averaged 16.9MPG over hte life of my 29k miles. 2011 King Ranch 20" 3.55
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Old 01-07-2012, 07:33 AM   #8 (permalink)
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Current tank is 19.4 with 20's, 3.55, mixed highway/city. This is higher than normal, it is usually 18-18.5.

I have been experimenting since I had a "shuddering" issue. Now I only use Chevron/Texaco and PM-22A, the truck likes that combination. Seems like a pattern is developing - adding more PM-22A than recommended seems to increase MPG - FoMoCo seems to like that.
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Old 01-07-2012, 11:34 AM   #9 (permalink)
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He was idleing to stay warm.
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Old 01-07-2012, 10:52 PM   #10 (permalink)
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WHY IDLE???? You'll be threading on here in a few that your either blowing blue smoke or eating starters, it will never hurt to let it idle to save a couple of nickles vs. spending mega dimes on other parts that were wore out during stopping & starting!
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Old 01-08-2012, 08:52 AM   #11 (permalink)
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Prolong Idling is Satan's Playground..It should be avoided.. If its -0 I can see at times idling is valid, but 20+ and prolonged Idling is wasted money and wear.Of coarse their are reasons to Idle,IMO I see trucks Idling for NO reasons other then Personal Preference,if that is the case I consider it foolish.
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Old 01-08-2012, 11:01 AM   #12 (permalink)
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?

that makes no sense to me. my nabor has several diesels and he never lets his truck sit and idle, says its unnessisary wear on the engineand wastes expensive fuel, even in cold weather, once an engine is warmed up it will take more than an hour or so to cool off so theres no need to let it idle.
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WHY IDLE???? You'll be threading on here in a few that your either blowing blue smoke or eating starters, it will never hurt to let it idle to save a couple of nickles vs. spending mega dimes on other parts that were wore out during stopping & starting!
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Old 01-08-2012, 11:05 AM   #13 (permalink)
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that makes no sense to me. my nabor has several diesels and he never lets his truck sit and idle, says its unnessisary wear on the engineand wastes expensive fuel, even in cold weather, once an engine is warmed up it will take more than an hour or so to cool off so theres no need to let it idle.
Your neigbor is correct.

prolonged idleing leads to wetstacking unless you are high idling it.

shut it down!
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Old 01-09-2012, 09:18 AM   #14 (permalink)
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I agree with everyone on the prolonged idling. My purpose for the post was to give MPG data for anyone who is looking for info. I know when I was looking to upgrade to the 12, seeing the info out there was handy.

Also last fill up 15.95 MPG 70/30 highway/around town, no real idling to speak of.
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Old 01-09-2012, 10:44 AM   #15 (permalink)
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What is PM-22A?
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