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5.7 hemi milage


This is a discussion on 5.7 hemi milage within the Heavy Duty forums, part of the 4th Gen : 2009 - Present category!
Hi all I know there are some threads out there about this but none I found were specific enough so ...


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Old 01-08-2017, 09:23 AM   #1 (permalink)
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Default 5.7 hemi milage
Hi all
I know there are some threads out there about this but none I found were specific enough so sorry to open another! Just bought my first ram. Always been a Ford guy! I like my 14 2500 5.7 4x4 crew cab long bed quite a bit so far. This truck has 3.73 gears and it does have 285 tires on it. I know we don't buy these trucks for fuel economy but I just took a rd trip about 200 miles and the truck seems to be getting under 11 mpg. I do not have a heavy foot I did have the cruise set to 75 most of the trip the tach was sitting about 2500 rpm. If this is what it gets so be it but just seems to me awful low for even this truck. So, looking for any advice on what I can do. I worried what it will get with 10000# behind it!! Thanks in advance.


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Old 01-08-2017, 09:43 AM   #2 (permalink)
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i have an 06 megacab 2500 4x4 with 5.7
Its all stock
get about 10mpg according to the MPG readout
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Old 01-08-2017, 10:02 AM   #3 (permalink)
 
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I had an 07 MegaCab 5.7L and highway mileage rarely exceeded 13 mpg. I towed with it (9K) several times a year and it dipped to 9 unless I was fighting headwinds ...then it got worse.


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Old 01-08-2017, 10:10 AM   #4 (permalink)
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Sounds like it may be normal. Anyone out there know if a programmer or a fresh air intake will help? Or any other ideas. Thanks.
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Old 01-08-2017, 10:22 AM   #5 (permalink)
 
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Lot depends on terrain you drive on, mountains or flat? It's a tall, 3.5 ton truck, slowing down a bit might gain you a little too..

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Old 01-08-2017, 10:30 AM   #6 (permalink)
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Mine's a '15 SC LB 2500 4x4, and my best highway mileage to date has been 15.5, my calculations. I average closer to 13 or so, though.

Recently pulled a loaded 12' uhaul trailer from central GA to central IL and got about 9.5-10 or so.

es


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Old 01-08-2017, 02:11 PM   #7 (permalink)
 
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Do you have a tonneau cover or topper on your truck yet? They usually help a little. Also, slowing down to 67-70mph will help. I've my truck seems to have a fuel leak above 70mph (j/k). But my mileage is a lot better under 70mph. That goes for my current 6.4L Hemi as well as my 1500 with the 5.7L Hemi.

I've never tuned a gasser, but the problem with the tuner on my old Cummins was that it was way too fun to drive. I was never light on the throttle, so I actually saw lower MPG's after the tune.

If you just got the truck, and live in a cold climate, wait for the summer gas blends. You will see a little better mileage then.
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Old 01-08-2017, 02:24 PM   #8 (permalink)
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With those over-sized tires and rolling at 75MPH that sounds about right. Stop/go driving and speeds over about 65 really hurt my MPGs in a hurry with my 6.4 Hemi.
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Old 01-08-2017, 06:03 PM   #9 (permalink)
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Something seems off to me. On my 6.4l with 3.73 at 75mph I am only turning 1800 rpm, if I put it into 5th manually it turns 2500rpm...


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Old 01-08-2017, 07:40 PM   #10 (permalink)
 
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Are you driving in T/H, by chance?
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