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Old 03-13-2020, 02:46 PM   #1
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Ram gasser 6.4 Hemi mileage

Finally had a chance to go through the DW logs on our trip to and from Key West Florida.
Our 2016 Ram 2500 6.4 gas Hemi with 3.73 rear end did 9.23 mpg on the way down to Florida with no wind issues any of the four days.
The four day trip home was a different beast with the NW wind challenging the old truck (and myself). Ended up with a final figure of 7.75 mpg to get home.
The gasser did a great job (we thought) of pulling our 2017 Rockwood 8289WS fifth wheel that is 32 feet long and 13 feet high. Used tow/haul and cruise both directions.
First long trip in many years with a gas tow vehicle since selling our diesel. Think we made an ok decision going back to a gasser.
Not trying to start the dreaded gas versus diesel debate but a while back someone was asking about real life numbers regarding the 6.4 Hemi so thought I would share.
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Old 03-13-2020, 03:06 PM   #2
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So what was your driving speed. I just came back from round trip from Atlanta race track total 180 miles and just bout a new 5er and average 10.0 at 60 mph no wind either way. Camper is 33 ft long and can max out at 12,000 but I don't think i carry that much. Same truck as yours just newer and I only use Tow haul when I think its needed. Later RJD
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Old 03-13-2020, 03:21 PM   #3
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Interstate speed was 68 mph with the cruise set. The short distance we drove on state/county highways cruise was set at 58mph. I did notice the lie o meter showed better mpg when on the slower highways.
We hit the Cat Scales when we started the trip.
Truck alone: steer axle 4300, drive axle 3600 and gross weight 7900.
truck and fifth wheel: steer 4140, drive 5340, trailer axles 8280 and gross weight of 17,760.
Maybe I'll try without the tow/haul engaged when we hook up again.
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Old 03-13-2020, 03:30 PM   #4
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You be surprised by dropping speed to 62 how much better mpg gets. Later RJD
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Old 03-13-2020, 04:11 PM   #5
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badger5301, I have the same set up truck. I pull a Vengeance 31v dry is 8700 and change but loaded around 10.5K. I drive usually 60 to 65 mph and can average around 9 mpg. This past weekend we had to drive around Dallas on 635 and I-20 so averaged around 70 mph and yeah we averaged 7.8 mpg on our trip. Dropping to 60 mph makes a huge difference. Sucks it is only a 28 gallon tank so if I go more than 150 miles I start searching for a gas station. But I love the truck. For the record mine is 2 wheel drive.
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Old 03-14-2020, 02:49 PM   #6
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Quote:
Originally Posted by aceinspp View Post
You be surprised by dropping speed to 62 how much better mpg gets. Later RJD
X2............at 65 MPH we get 10 MPG towing our 5er. If I drop the speed to 62 the mileage increases to 11 MPG.

So, a 5% decrease in speed = a 10% increase in fuel mileage. Im in!
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Old 03-14-2020, 03:14 PM   #7
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Your Hemi is very close to my Tundra 5.7. I have a 4:30 rear end which is good in some ways and bad in others. Our 8528RKWS is also 31'11' and weighs around 9,000 lbs. Here are the metrics from our "Western Walkabout" which suggest your MPG numbers are pretty close to mine.
• $3,086.46 Gas Cost
• 1,043.288 Gas Gallons
• $2.958 Average Gas Price/Gallon
• 9,992.73 Miles Travelled
• 9.78 average MPG
• $0.31 Average Cost per Mile
• 238.03 Driving Time Hours
• $1,762.58 Camp Site Cost
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Old 03-14-2020, 06:16 PM   #8
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Quote:
Originally Posted by badger5301 View Post
Not trying to start the dreaded gas versus diesel debate but a while back someone was asking about real life numbers regarding the 6.4 Hemi so thought I would share.

I was pouring gasoline near my campsite. I didn't mean to start a forest fire..... Hopefully folks will remain civil.
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Old 03-15-2020, 10:59 AM   #9
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Ram 2500 hemi mpg

I had a Ram 2500 crew cab 4x4 with a hemi. On a trip from Missouri to Kentucky I got 6.5 mpg. Plenty of power through the mountains just had to use more gas petal. Probably would have got better mpg if I drove slower. I ran 70 - 80 the majority of the way. My toy hauler is 32 ft and weights less than 8000 lbs. When I came back I ordered a Ram 2500 crew cab 4x4 with a diesel. It is not fully broken in but at the same speeds I get 9-10 and plenty of power. Usually don't have to override the cruise control
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Old 03-15-2020, 02:49 PM   #10
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We love our 2018 Ram 6.4L 2500. It rides great when towing or not. We noticed our gas mileage improved after 5000 miles on the truck. It kicks into eco mode on level roads so that helps. Towing we get about 10 -11 mpg. Our Windjammer is very fully loaded and about 8000 pounds. Truck usually has 2 adults and 2 big dogs. While not towing, it gets about 17Mpg
.. about the same as our gas hog Town and Country mini van!
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