5.7 Hemi VS 6.4 Hemi

Discussion in 'Engine & Performance' started by katactical, Jul 9, 2014.

Sponsored By: Moe's Performance
  1. meedom

    meedom Senior Member Military

    Posts:
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    Joined:
    Aug 1, 2016
    Location:
    USA
    Ram Year:
    2016
    Engine:
    Hemi 5.7
    I gotta say it, if anyone thinks a Ram 2500 gasser is gonna get close to the mileage of a 1500 5.7 they're just crazy. It's physics guys, you're talking about a vehicle that weighs a minimum of 1200 pounds more! The only way it could compare mileage wise is with the 6.7 diesel....
     
  2. tsielski

    tsielski Senior Member Military

    Posts:
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    Joined:
    May 11, 2016
    Location:
    North Carolina
    Ram Year:
    2017
    Engine:
    5.7 Hemi
    I've had two Rams with diesels, and now the 1500/5.7. The 95 2500 with 5.9 Cummins and a 5-speed was a good truck, and even after I hot rodded it (370 injectors, completely recalibrated P7100, larger turbo and a 4" exhaust), it would get ~20 mpg empty on the interstate if I kept the speed to around 70 (3.54 gears). I'd still have it, if it wasn't rusting away, thanks to all the winter salt.
    My 2011 3500 SRW with the 6.7 Cummins and 4.10 gears was a much more refined truck, and for the 4 years it was deleted, it was superb. Deleting didn't net the fantastic mileage gains I'd frequently read, but driveability was much improved. As soon as inspections here began looking for diesel emissions equipment (installed & operational), I returned it to stock and drove it for another year. Highway mileage was 16 on a good day. Deleted, it was around 18, both unloaded, not towing. I will say, I towed 16,000# (JD 1010 with a huge Ford backhoe attached, while it was deleted but no additional power to avoid shredding the transmission) for several hundred miles, and that truck handled that load like a pro.

    The new diesels do get decent mileage. From what I've read on the TDR, around 20 highway unloaded, but like many have stated, the emissions equipment is complex and has way too many potential failure points, not to mention the eventual need to replace the DPF for $2k+ as the truck ages. Had I a need to tow heavy periodically, I would probably have another diesel.

    I thought long and hard about getting a 2500 with the 6.4. However the 3500# enclosed cargo trailer I tow periodically is no issue for my 1500, and the 1/2 ton is way more comfortable. Most often, the only thing this truck hauls around is my butt, and I really didn't need another HD truck to do that. The 1500 has gotten a high of 21+ mpg on the interstate, and thats with 3.92 gears. Towing the trailer it drops to ~ 14, but the trailer is 6' + tall and wind resistance takes its toll. No regrets tho.
     
  3. pcschwenke

    pcschwenke Senior Member

    Age:
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    Joined:
    May 26, 2015
    Ram Year:
    2015
    Engine:
    6.4 Hemi
    I had a 2015 5.7l with 8 speed and 3:21 gears which got around 20mpg hwy and 15mpg city. Towing a 8klbs it averaged around 11mpg. With my new 2016 3500 with 6.4l and 4:10 gears I get around 15hwy, 11 city, and 9.5 towing. Now where near comparable, but it’s a beast. It’s still being broke in at 6500miles though.
     
  4. Reeb

    Reeb Member

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    Joined:
    Sep 6, 2016
    Location:
    Shuswap Living
    Ram Year:
    2011
    Engine:
    Hemi 5.7
    I have a 5.7 2500 with 4.10's and I get just under 14mpg empty 50/50 city/Hwy driving.
    I get about 9mpg with roughly 6-7000lbs on the hitch hwy driving.
    I try not to get too far over 60mph and never under 55mph. I went from the interior of BC to northern Alberta and back. Straight up the Rocky Mtns.


    Sent from my iPhone using Tapatalk
     
    Last edited: Oct 17, 2017

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