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Old 06-05-2013, 05:44 PM   #1
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Best Highway Solo Diesel MPG?

Just got my best mpg non-towing of 18.8mpg 2012 F-450. The truck just trurned over 8,000 miles. If you asked me my non-towing highway mileage before today I would day 16.5. The trip computer recorded 18.8 mpg with 99% highway. The real-time bar display that I reset after hitting the highway acutually recorded 19mpg.

The over-all trip was 280 miles from elevation in western Pa. of 2450 feet to destination elrvation of 800 feet. I did this trip last year with 4,000 mileage on thd truck and got 16.5. Now close to 19.

What could cause the increase in mpg? Diesel is breaking in?

Note - I am not complaining.
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Old 06-05-2013, 06:43 PM   #2
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A computer tries to compute as best it can.

Miles divided by gallons on a calculator may differ.

Just sayin.....
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Old 06-05-2013, 07:43 PM   #3
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I agree. Computer is nice, but not necessarily right. The 6.7s have been shown to be pretty good at mileage mostly.
Can be differences in motor "breaking in", fuel, temp, humidity, altitude obviously, and many other factors.
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Old 06-05-2013, 08:43 PM   #4
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Quote:
Originally Posted by tuffr2 View Post
Just got my best mpg non-towing of 18.8mpg 2012 F-450. The truck just trurned over 8,000 miles. If you asked me my non-towing highway mileage before today I would day 16.5. The trip computer recorded 18.8 mpg with 99% highway. The real-time bar display that I reset after hitting the highway acutually recorded 19mpg.

The over-all trip was 280 miles from elevation in western Pa. of 2450 feet to destination elrvation of 800 feet. I did this trip last year with 4,000 mileage on thd truck and got 16.5. Now close to 19.

What could cause the increase in mpg? Diesel is breaking in?

Note - I am not complaining.
I think different brands/blends of fuel can cause mileage to vary as well. I am sure being broke in helps as well too.
Chad
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Old 06-06-2013, 07:03 AM   #5
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The Ford gallons used on the trip computer is always within a .2 gallons of actual. In this case I went 280 miles on 14.9 gallons. The fuel needle is where it should be with 14.9 gallins gone.I will fill up before Sunday to verify the computer.

I had a F-150 before this F-450. It also had a very accurate computer for fuel used.
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Old 06-11-2013, 07:37 AM   #6
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'07 Dura .6.6 LBZ 4wd Silv Classic. 4" cat back exhaust. Bullydog GT. Cold air intake. EGR Block. Syn fluids. Regularly get 22-23 hwy solo. 10-13 towing 14k FWTH at 63 mph.
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Old 06-11-2013, 10:02 AM   #7
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According to my computer, my Dodge Ram Cummins gets 23.4 on non-towing hwy trips. It has 200k on it and I usually set the cruise at about 68 on the interstate.
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Old 06-11-2013, 10:06 AM   #8
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12 Ram 2500 CTD CC LB 3.73. All stock. 17.5mpg running 70mph on the freeway. 18-19mpg 55-60mph hwy.
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Old 06-11-2013, 10:19 AM   #9
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Well,
you WERE going downhill most of the way

I think of mpg as a novelty and really don't watch it....although with the right driving style even this shoebox goes thru the wind pretty well !

too many variables, including the 'escape from reality' of some that tout their mpg (not anyone on THIS site of course !!!!)
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Old 06-11-2013, 01:00 PM   #10
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I did fill up and the gallons used was 21.7 on the computer but I was able to squeeze in 22.1. Almost 1/2 gallon off or about 2%

Tomorrow I tow the 5er the other direction. From an elevation of 800 feet to an elevation of 2450. Last year the computer said 10.3mpg on this trip. I am guessing I will get better this year.
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Old 06-11-2013, 03:53 PM   #11
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Been thinking abour getting a Dodge with the 6.7 Cummins, or possibly an F-250 diesel. I tow a TT that weighs about 6,000# and get about 10.2 mpg with a 2011 F-150 with a 5.0. Anyone towing that light a load? If so, what kind of towing mileage are you getting?

Thanks...

Jack
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Old 06-11-2013, 04:42 PM   #12
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From my understanding a F-250 diesel should get around 15 mpg towing 6,000 lbs. I get 13 towing with a 2012 F-450 towing a 6,000 lb areodynamic trailer. My truck only has 8,500 miles so I think the engine will do better at 15,000 miles.

I had a 2011 F-150 5.0 litre. I really liked that truck. I give it a solid 'A' as a 1/2 ton truck. I hated giving it up.

Going from a F-150 5.0 litre to F-250 diesel will be going from a very good 1/2 truck to a very good 3/4 ton truck. Either truck will make you smile.
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Old 06-11-2013, 04:57 PM   #13
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18.5 hand calculated out of a 6.7L Cummins dually with 4.10 rear end.
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Old 06-11-2013, 08:34 PM   #14
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Have a 08 ram 2500 hd. With 6.7L Cummings towing 8000 TT I get 13 mpg with max speed at 65 towing. Truck by itself on a trip from Florida to Pa I got 20 mpg without towing, in town I normally get 13-15 depends on how hard I get on the turbo
Love the Cummings as I do not have to buy the DEF fluid to put in as well, Cummings has a built in DEF filter that self cleans itself.
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