Mpg advice, what rpm or speed - Dodge Cummins Diesel Forum
2013-2018 General Discussion General Chit Chat About the 2013 model year differences 6.7L 4th generation Cummins - NO ADVERTISING -

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post #1 of 47 (permalink) Old 01-24-2020, 05:38 PM Thread Starter
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Mpg advice, what rpm or speed

I know there is 909 of these threads but hear me out. I moved south a bit and Iím commuting about 90 miles a day mostly highway. I know itís winter so mileage is worse and my truck is a 9k LB brick. I am on I95 so I have to drive at-least 65-75 to stay alive and not get run over.

Truck is a 2013 3500 DRW with 3.42 gears and stock tires. I do have a pretty heavy full tool box, not sure if lightening it up a couple hundred LBS will do anything= real world results.

I drive 69 mph on the weekends (less traffic). During the week I lock her in at 72. Truck is 100% stock and Iím averaging 15.xx the last 3 tanks only commuting and no towing.

I get that thatís not terrible but any help in mpg would be a big help. Iíve thought about trading to an SUV but Iíve always had a truck, I like the reliability of my truck. I only have 105k miles and Iím sure I can run her many more miles without worry so Iíd like to keep her. But letís be honest she isnít cheap to run.

Worst part is I no longer need a truck. I sold both my trailers and my equipment in order to buy this new house.

I guess I probably need to accept the reality it is what it is???


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post #2 of 47 (permalink) Old 01-24-2020, 05:39 PM Thread Starter
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Oh and to add I bought my wife the house.. happy wife happy life! I would have purchased older with land, now I don’t have anything to do and no room for Man toys. Tractors/trailers, etc.
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post #3 of 47 (permalink) Old 01-24-2020, 06:00 PM
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Best you can do with the current truck is slow down.

Personally, if I HAD TO commute 90 miles a day, I'd buy a decent riding car that got 30 MPG or better.

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post #4 of 47 (permalink) Old 01-24-2020, 06:31 PM
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Yep, I'd buy a cheap commuter econobox and burn the miles up on that.
Back in the day, I drove a $500 '67 Toyota Corona to and from work..also 90 miles round trip.
I too had a nice truck to drive but it stayed in the garage.
Yes, I put a qt of oil in each week and people laughed as they passed me. It only let me down once when it threw a timing chain.
Late model sedans are cheap these days, everyone with a belly button wants a SUV.
If it were me, I'd get a used diesel Chevy Cruz with a 6 speed.
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post #5 of 47 (permalink) Old 01-24-2020, 06:33 PM
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I used to drive 100 miles a day and would buy a used car that would get 30-35 mpg to drive instead of running miles up on my truck!!! Can't beat a Toyota or honda they go forever!!!LOL
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post #6 of 47 (permalink) Old 01-24-2020, 07:43 PM
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When we moved to our current house I had a 110 mile round trip commute. I bought a used Saturn with 110,000 miles on it and drove it to nearly 300K miles in 10 years before I retired. It never left me stranded and saved so much wear and tear on the '97 1500 Ram I had at the time.
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post #7 of 47 (permalink) Old 01-24-2020, 07:59 PM
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Get a used Camry, Accord, or Altima and park the truck. Drive the truck to work on bad weather days, or once every week or 2 to run it. Parking anything for a long period of time is not good.
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post #8 of 47 (permalink) Old 01-24-2020, 08:54 PM
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What everyone said. It makes no sense to drive DRW as a daily commuter vehicle.
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post #9 of 47 (permalink) Old 01-24-2020, 08:57 PM
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Only thing you can do is slow down, use cruise control and try not to change speeds. Its a 9k pound dually, nothing is going to run you over. Most semi trucks do not go much over 70.

Personally I could not go to a small car for commuting, worst thing for me is a small car in traffic, the fear of truly getting crushed is just not worth it, I am so much more comfortable in something big and something I can see over most other cars.
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post #10 of 47 (permalink) Old 01-24-2020, 09:09 PM
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62 MPH max for fuel economy. Personally I will never drive a car again. I have been driving a Cummins since 1999

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post #11 of 47 (permalink) Old 01-24-2020, 09:40 PM
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Driving at 62mph (or under 1500rpm) is where I get my best mileage. I've tried a lot of other speeds and 62 seems to be the sweet spot for me.

Highway tires and wheels with factory offset and bumping up the tire pressure (worse ride) gets better mileage as well. Hyper mile/coast to the best of your ability when you can. Keep the exhaust brake and tow haul off and don't force downshifts unnecessarily. Keeping the paint clean and slick with a good paint sealant or ceramic coat helps a tiny bit as well, including on the windshield. Tonneau cover does help as well, I've noticed about 0.5 to 1L/100km's better with it installed.

I've never tried fuel additives but I can tell you that I get the best mileage on CO-OP diesel. I've tried a lot of other stations and can't get the same fuel economy.

The best mileage I got with my truck stock was 9.6L/100km's hand calculated with my srw over 500km's with no wind. Deleted I achieved 7.8L/100km over 200km's with a tail wind. On highway commutes I can regularly get 8.5 to 9L/100km's in the summer and 10 in the winter.

Our second vehicle is a 2015 Chevy Cruze with the 1.4L turbo and 6 speed automatic. If we try for fuel economy we can get around 4.5 to 5 L/100km's. It's phenomenal on gas and personally there is no way I will get a diesel car or half ton. I much prefer gasoline for the power, ease of maintenance, cold start ability and the fuel economy is almost as good now a days.

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post #12 of 47 (permalink) Old 01-24-2020, 09:50 PM
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So, I drive alot. Yea, I "COULD" get a smaller truck and save a few bucks, but I like the luxury of this RAM. ( I've modified the inside, as I do with most the trucks I live in for 8 to 12 hr a day).

My driving is about 60 / 40 highway to in-town type driving. I have a few homes I live in, between cities. I keep my Wife up north in a small town about 120 miles from the city where I mostly work. So, I drive there once a week. ( actually getting ready to leave now. I like the long drive, as it allows me to clear my mind of the crazy stuff I see during the week. I leave my stress behind, and it sheds off as I drive to my true home)

On the highway, I've gotten a solid and reliable ~22MPG. I have to keep it at or under 65, I normally use cruise control. However, if its hilly, I'll control the throttle. I can gain some speed as approaching a hill, and coast going down. I limit the use of EB, as it steals any energy used in the forward momentum.

City driving, I try to use freeway / highways as often as I can. For one, it is usually non stop and gives me the ability to reroute as needed. When actually driving on the streets, try to coast to upcoming stops. For example, if there is a STOP sign ahead, I'll coast a few yards to the stop.

I've found it best to accelerate rapidly to speed, instead of taking 5 miles to speed up to 60MPH.

I think my overall AVG is ~16MPG. But, like I said, I can cruise on the highway and see ~22MPG. Or ~18MPG if going over 70MPH.

When towing, if I lock out 6th, and hover RPM around 2000, I get good MPG. ~10MPG when pulling my very heavy trailer.


You may want to look at Pedal Commander. It has an "Eco" setting that will improve your MPG.
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