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Old 06-24-2019, 07:50 AM   #1
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Solo Diesel Fuel Economy

The DW myself and are two Poms made a solo run in the RAM from the Charlotte, NC area to Pottstown, PA (150E to 77N to 81N to PA Turnpike East) last week for a short vacation to visit Family a little over 1K round trip hand calculated the MPG was 23.30 not bad for a heavy 4x4 diesel.

I didn’t buy any diesel fuel in PA it was too expensive at around $3.39 so I coordinated my stops where it was cheaper like VA and NC. Diesel here in my neck of the woods is $2.39
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Old 06-24-2019, 08:16 AM   #2
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That's very good, I just drove my brand new Ram from the dealer in Idaho to Reno and got 19.3. My average speed was faster than your 62 though.
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Old 06-24-2019, 03:21 PM   #3
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Originally Posted by Ejs4029 View Post
The DW myself and are two Poms made a solo run in the RAM from the Charlotte, NC area to Pottstown, PA (150E to 77N to 81N to PA Turnpike East) last week for a short vacation to visit Family a little over 1K round trip hand calculated the MPG was 23.30 not bad for a heavy 4x4 diesel.

I didnít buy any diesel fuel in PA it was too expensive at around $3.39 so I coordinated my stops where it was cheaper like VA and NC. Diesel here in my neck of the woods is $2.39
Avg mpg from the on board computer tend to be wrong . best way is fill drive x miles the fill again and divide gallons used into miles driven for an accurate mpg figure
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Old 06-24-2019, 03:54 PM   #4
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2014 Duramax does an average of 24-26 on the run down to our cabin and back. 200 mile round trip.
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Old 06-24-2019, 04:14 PM   #5
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Originally Posted by MR.M View Post
Avg mpg from the on board computer tend to be wrong . best way is fill drive x miles the fill again and divide gallons used into miles driven for an accurate mpg figure
23.30 MPG was hand calculated
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Old 06-24-2019, 05:07 PM   #6
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Best I can get on my 2012 F250 6.7 is 21mpg. I am pleased truck has 100,000 miles and purrs like a kitten. Loves to tow.
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Old 06-25-2019, 12:27 PM   #7
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Avg mpg from the on board computer tend to be wrong . best way is fill drive x miles the fill again and divide gallons used into miles driven for an accurate mpg figure
If I'm not running my generator, my onboard computer mileage is usually within 1% to 2% of my hand calculated mileage. Generator fuel use doesn't seem to get calculated in by the computer, so neither method is going to be accurate there.
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Old 06-25-2019, 02:53 PM   #8
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I drove from Raleigh,NC to LI,NY and averaged 24.1 in my 2017 2500 Diesel Ram CC..empty. Surprised the heck out of me...
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Old 06-25-2019, 02:55 PM   #9
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That's very good, I just drove my brand new Ram from the dealer in Idaho to Reno and got 19.3. My average speed was faster than your 62 though.
Once you go over 65 the mpg's drop like a stone in my experience..
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Old 06-25-2019, 07:32 PM   #10
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Best I can get on my 2012 F250 6.7 is 21mpg. I am pleased truck has 100,000 miles and purrs like a kitten. Loves to tow.

Same truck as Charles but with "only" 96, 400 miles! I have averaged 22 at times but usually closer to 21 MPG also.


Just finished a trip in excess of 3000 miles pulling the TT. Was overjoyed with an average 11.7 MPG running about 62 MPH on average when on open roads/Interstates.
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Old 06-26-2019, 06:43 AM   #11
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I have a consistent commute to work that I have made in a diesel for almost 20 years. I have also made the trip in my Duramax many times now and my mileage is highly dependent on the conditions such as driving speed, wind speed and direction. These can make a huge difference in my mileage. I ultimately hand calculate every fuel tank mpg but my instant dash calculator has proven to be very close to the hand calculation. I had a trip in my duramax doing 75 and averaging 26.5 mpg with a strong tailwind. I would have been lucky to get 15 driving the same speed into that wind. I normally average about 18.5 - 20 mpg in my duramax on a road trip not towing.
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Old 08-08-2019, 12:02 PM   #12
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Originally Posted by Ejs4029 View Post
The DW myself and are two Poms made a solo run in the RAM from the Charlotte, NC area to Pottstown, PA (150E to 77N to 81N to PA Turnpike East) last week for a short vacation to visit Family a little over 1K round trip hand calculated the MPG was 23.30 not bad for a heavy 4x4 diesel.
Great mileage! We get about 22 or so on highway. Have an ARE cap w/ Thule rack and basket. About 12 mpg towing.
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Old 08-08-2019, 12:17 PM   #13
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My 2014 GMC 2500HD Duramax averaged 26.8 to 27 interstate. I did hit 28 mpg for about a 50 mile stretch once...perfect conditions. 16-18 in town. So far my 2019 Colorado Z71, I've managed 27.6 on interstate and 18 in town. 3.6 V6
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