MPG help - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 9 (permalink) Old 07-02-2011, 04:17 PM Thread Starter
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MPG help

Ok im running 6.7 auto 4:10 gears towing 16K 40 foot fifthwheel.
I just ran from PA to SC to myrtle beach and I expected more MPG.
I ran 68-70 MPH Im deleeted running the smarty JR on Tow. my one tank where I ran 70 most of the time and never droped out of 6th gear it got 8.97
then i had my best tank at 10.3 I would have thought my worst tank would be 10.3

Im going back on the same trip the end of the month and Im thinking of running it on stock power level do you guys think it will help?

08 F-350 crew cab Lariat 4X4 Dually auto 4:10 gears.
rideing on Hankook Dyna pro AT's
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post #2 of 9 (permalink) Old 07-02-2011, 05:38 PM
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Did you have a lot of wind on this trip?

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post #3 of 9 (permalink) Old 07-03-2011, 12:49 AM
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My guess is your not that far off. I pull a 12,000lb 36' trailer and do 10.3 but thats up and over mountains with a stretch of 8-10% grades and 15-20mph curves on the grades. Generally keep it at 60mph. Can do 12 on the flats.

Is your trip flat lands or hills? You are doing 70mph, 16k lbs and a dually with 4.10 gears. All three of those hurt your mileage compared to my truck. Have you tried keeping it 5th, while towing that kind of weight might help mileage and save the tranny, (See my 68rfe problem thread)

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post #4 of 9 (permalink) Old 07-03-2011, 01:51 PM Thread Starter
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Quote:
Originally Posted by neeltburn View Post
Did you have a lot of wind on this trip?
no, no bad head winds

08 F-350 crew cab Lariat 4X4 Dually auto 4:10 gears.
rideing on Hankook Dyna pro AT's
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post #5 of 9 (permalink) Old 07-03-2011, 02:05 PM Thread Starter
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Originally Posted by Dodgefarmer View Post
My guess is your not that far off. I pull a 12,000lb 36' trailer and do 10.3 but thats up and over mountains with a stretch of 8-10% grades and 15-20mph curves on the grades. Generally keep it at 60mph. Can do 12 on the flats.

Is your trip flat lands or hills? You are doing 70mph, 16k lbs and a dually with 4.10 gears. All three of those hurt your mileage compared to my truck. Have you tried keeping it 5th, while towing that kind of weight might help mileage and save the tranny, (See my 68rfe problem thread)
the trip is 90% flat the funny thing was i got better mpg when i was on the hilly section. and when i ran 65-68 seamed to help. once i broke 70 it droped bad.
I did see your 68RFE post I think if i get to 100K I will be getting a newer truck or pulling it for new clutches. What I was told by ATS was not to run the higher gears 5th and 6th below 1600 rpm. when you are loaded.
they set it up to hold 6th down to 1000 rpm and the pump dont have enough rpm to keep enough pressure to hold the clutches when you are loaded. and then they slip. once that happens a few times they glaze and it is all over.

but what do you guys think will the stock power setting help MPG or do you think I just need to run 65 MPH

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post #6 of 9 (permalink) Old 07-04-2011, 03:59 AM
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I will see if I can find it again but cummins has a MPG bulletin out there and it explained MPG percentage loss after 55mph. I have tried this, when I left the smokies last year I ran 55mph through the mountains and broke 13 mpg. when I got closer to home I ran the speeds up to about 75 + or - a few MPH and I got 10.1ish mpg.. Mind you I have 3.73s and figure the toyhauler to be at about 10,500 lbs. Try running 55 on a trip and see what kind of mileage you get. Remember not to also let the motor lug. I am not sure that you will see a gain going back to a stock power setting. I think speed combined with weight will be the biggest factor.

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post #7 of 9 (permalink) Old 07-04-2011, 03:48 PM Thread Starter
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I dont think i can do 55, Maybe I will try to run 63-65 I think your right the speed is everything. Maybe I should try the 40HP setting it is made for MPG right?

08 F-350 crew cab Lariat 4X4 Dually auto 4:10 gears.
rideing on Hankook Dyna pro AT's
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post #8 of 9 (permalink) Old 07-05-2011, 01:34 AM
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try the 40hp and keep your speeds down, that should help you a lot to get better mileage, also slower acellerations will help as well, try to keep the RPM's under 2000rpm

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post #9 of 9 (permalink) Old 07-05-2011, 03:18 AM
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I saw an increase from the 40hp tune to the 70 hp tune, it is worth a shot though Dave as it only takes a few min, to load the tune. Give it a go, your results could turn out different than my results.

"Only accurate rifles are interesting" -Townsend Whelen

2012 Ram 2500 Crew Cab Big Horn
6.7L 68RFE 4wd
Yeah its stock.
Edge Insight CTS / Line-X / Access Bed Cover
B&W Turnover Ball / Companion Hitch
Pac Brake Air Bags
On Board Air
Optima Redtop 34Rs


2010 John Deere 2305
2010 Jeep Wrangler JK Unlimited Rubicon/ Tuned with some toys.
2016 Keystone Impact 311 Toyhauler






9-11-2001 NEVER FORGET
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