Hypermiling a diesel truck?

Discussion in 'Diesel powered automobiles' started by carrmann, Sep 19, 2013.

  1. carrmann

    carrmann Well-Known Member

    Has anyone had any success hypermiling a diesel truck? Just curious.

    Im getting about 21-23mpg highway with my 2005 doge ram 2500 4wd cummins quad cab automatic, and around 18-19 combined.

    uncomfortable about shutting it off at lights due to the heavy demands on electrical/battery etc. anyone have any experience?
  2. Not much difference than cars. Hopefully you have lrr load range e tires at 80+ psi. Lifted? Mine always seemed to love 60-62 mph
  3. xcel

    xcel PZEV, there's nothing like it :) Staff Member

    Hi Carrman:

    Look up the 2011 Ford F-250 Super Duty 4x4 with the 6.7L Turbo Diesel review. From Phoenix to Chicago and it provided something like 29 mpg. A great truck!

    The 2014 RAM 2500 4x4 HD with the 6.7L Cummins I drove last month was equally impressive!


  4. carrmann

    carrmann Well-Known Member

    right now no. the tires that it came with are nitto terra grapplers. as soon as they are low enough I will be replacing them. Did not know about LRR for heavy duty applications. excited now though haha. Will be getting some for sure!
  5. carrmann

    carrmann Well-Known Member

    awesome! I will check those out asap.

    heard nothing but bad about the fuel economy of the new diesels. BUT... most of those people haul stuff (including me).

    i see 15-17mpg or so towing apprx 8000lbs in various situations (city, mountains etc)... so i really cant complain.

    is there a review of the ram? also.. do I see a check engine light illuminated??
  6. carrmann

    carrmann Well-Known Member

    will LRR tires make much of a difference for me? im currently running a 285/75/17 nitto terra grappler (what came on it when I bought it)... going down to a 265/70/17 (stock size).
  7. thunderstruck

    thunderstruck Super Moderator

    Unless your tires are about worn out you have to consider the time to recoup the cost of 4 new tires. How many miles would you have to drive before an LRR truck tire would pay for itself?
  8. carrmann

    carrmann Well-Known Member

    mine are worn out, hence replacing them. they are at the wear bars. they were bad last winter in the snow, this winter they will probably be scary.
  9. EdwinTheMagnificent

    EdwinTheMagnificent Legend In His Mind

    I may be wrong , but it seems the new size tire you're considering is smaller in diameter then the existing tires , which would raise your cruising RPM .
  10. ItsNotAboutTheMoney

    ItsNotAboutTheMoney Super Moderator Staff Member

    That could just be because he had it in accessory mode. You don't expect Wayne to have the engine running while taking a picture of the dash, do you?
  11. RedylC94

    RedylC94 Well-Known Member

    Edwin is correct, so that tire change would probably increase cruising fuel consumption. (Exceptions would be if the rolling resistance is a lot better, or if it allows the transmission to stay in its highest gear a lot more.) Apparent (as opposed to actual) consumption will be better with the smaller tires, if you don't correct for odometer errors.
  12. carrmann

    carrmann Well-Known Member

    well, its showing about 800rpm which is an idle. :confused:
  13. carrmann

    carrmann Well-Known Member

    right.. except the tires on my truck now are not 'factory' sized. they are wider/taller. the 265/70/17 is the correct size tire. The ones that are on it now are apprx an inch taller. :Banane15:

    Im hoping that a stock tire size would have less rolling resistance, and weigh less... which would give me better mpg (especially a LRR tire???). but I could be wrong. hence me asking!
    Last edited: Nov 12, 2013
  14. Neddy Seagoon

    Neddy Seagoon Active Member

    I guess everything is relative to what you drive. I have a 44 year old 109 Safari Land Rover with a 2.25 liter Diesel. It was designed to move up to 11 passengers plus gear any where they want to go.
    It has 61hp 104ft lbs so does not move fast, I have no idea what the MPG is but it has items on it that help.
    The front axle has locking hubs, so most of the time it is in freewheel mode. There is Synthetic oil and lube in the engine and powertrain. It has a Fairey overdrive on top of the normal 4 speed box. An lower hose engine heater for the winter months, electric cooling fan, cold air intake which can be quickly removed when going through water.
    The engine will not be modified as it has only 3 main bearings. The best thing is it is 44 years old and never been replaced so environmentally it is very good.
    By the way the only computer on board is the Rand McNally GPS and you can start the engine using the starting handle.

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