New tires... mpg improved so far...

Discussion in 'Dodge Ram Power Wagon' started by Docpaulo, Dec 16, 2017.

  1. Docpaulo

    Docpaulo Senior Member

    Posts:
    141
    Likes Received:
    25
    Joined:
    Dec 3, 2017
    Ram Year:
    2014
    Engine:
    Hemi 6.4
    So far I've noticed with city driving I'm even with old tires mpg... highway is definitely 1mpg better...

    I'm worried when i tow though how much power loss I'll notice
     
  2. Grand Mesa

    Grand Mesa Junior Member

    Age:
    60
    Posts:
    16
    Likes Received:
    6
    Joined:
    Jan 9, 2018
    Location:
    Western Slope, Colorado
    Ram Year:
    2016
    Engine:
    6.4
    Docpaula,

    Just a suggestion from a retired bean counter who always tended to check over my figures to keep from worrying about a billion dollar error. The stock Duratrac 285 70R17 on the 2014+ Power Wagons is listed as 33" diameter, whereas, the Falken AT3W 315 70/R17 is 34.6". That's 4.485% larger or approximately 5%. Maybe I am not looking at the same tire sizes and so it is possible that the difference could be the 7% that you stated earlier.
     
  3. continuecrushing

    continuecrushing Junior Member

    Posts:
    7
    Likes Received:
    4
    Joined:
    Oct 22, 2017
    Ram Year:
    2016
    Engine:
    Hemi 6.4
    I'll be interested to see my mpg after I put new wheels/tires on, but I've only got about 9 fillups to base it off of though.
     
  4. Docpaulo

    Docpaulo Senior Member

    Posts:
    141
    Likes Received:
    25
    Joined:
    Dec 3, 2017
    Ram Year:
    2014
    Engine:
    Hemi 6.4
    The earlier difference was after factoring in tire diameter difference...

    I now have my speedo recalibrated and i still see about 1mpg improvement highway and even to just a bit better with local driving... so at least with my pw and 4.1 gears and the way i drive... the tires caused no penalty...

    Honestly was ready for 1 to 2 mpg loss... being even is awesome
     
  5. Grand Mesa

    Grand Mesa Junior Member

    Age:
    60
    Posts:
    16
    Likes Received:
    6
    Joined:
    Jan 9, 2018
    Location:
    Western Slope, Colorado
    Ram Year:
    2016
    Engine:
    6.4
    I found how one would calculate the 7% difference such as on tiresize.com between a 285 70 17 tire and a 35x12.5x17. Their calculated figures are based on what the tire size should be, but each tire manufacturer makes their tire sizes to their own specifications.

    Glad to read and see that the Falken Wildpeak 315 70 17 fit nicely and takes the stock 8" wheel width.
     
    Last edited: Jan 12, 2018
    Chrisy and Docpaulo like this.
  6. Brakelate

    Brakelate Senior Member

    Posts:
    1,119
    Likes Received:
    533
    Joined:
    Aug 13, 2013
    Location:
    Page, AZ
    Ram Year:
    2013 Power Wagon
    Engine:
    5.7 Hemi
    Having done a similar swap previously on my 2013, I noticed little, if any loss in MPG. Where I did notice a bit of a step down in performance was not in pulling power, but in getting it stopped, especially when loaded up heavy or towing a larger trailer.

    The ride may be better due to the lighter load range, running reduced air pressures or both. Neither of which seemed to impact my MPG either, even when aired down quite low.
     
    Docpaulo likes this.
  7. Docpaulo

    Docpaulo Senior Member

    Posts:
    141
    Likes Received:
    25
    Joined:
    Dec 3, 2017
    Ram Year:
    2014
    Engine:
    Hemi 6.4
    Definitely a slight change in stopping power...
     
  8. craigsez

    craigsez Senior Member

    Age:
    53
    Posts:
    750
    Likes Received:
    201
    Joined:
    Aug 24, 2012
    Location:
    Novascotia,Canada
    Ram Year:
    2016
    Engine:
    5.7
    Something changed other than rims and or tires.....Goin from a 50% used tire to a brand new of same type on same rim would drop mpg....So something else has changed...You dont gain mpg with new tires
     

Share This Page