TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker and becoming a Supporting Member. For more info: Support TMC
Start a Discussionhttps://teslamotorsclub.com/tmc/tags/

NHTSA/EPA and MPGe

Discussion in 'Electric Vehicles' started by malcolm, Jun 25, 2012.

  1. malcolm

    malcolm Active Member

    Joined:
    Nov 12, 2006
    Messages:
    2,620
    http://www.nhtsa.gov/staticfiles/rulemaking/pdf/cafe/FE-label/FE-label_fact sheet_11242011.PDF

    Background http://www.epa.gov/fueleconomy/label/420r10909.pdf


    With the various tests/cycles the basic method seems to be; run the car on the dyno THEN recharge it, measuring the electricity drawn from the wall. Obviously this disadvantages electric cars with active cooling systems which will draw additional energy to cool the battery generated by the preceeding test and (depending on the recharging power) the additional heat generated by recharging.

    Given that this represents a sort of "road-trip" recharging scenario (though obviously not with a city cycle) does this matter? Well only in the sense that at present, ICE users are used to seeing MPG figures as best case and taking them with a pinch of salt. For EVs, it seems as though the MPGe numbers for some vehicles are not best case.


    Draft version here: http://www.smidgeindustriesltd.com/leaf/EPA/EPA_test_procedure_for_EVs-PHEVs-1-13-2011.pdf

    Presumably, Tesla will produce something like this: http://www.fiskerautomotive.com/Content/pdf/2012FiskerKarma_EPA_Fuel_Economy_Label.pdf
     
  2. Doug_G

    Doug_G Lead Moderator

    Joined:
    Apr 2, 2010
    Messages:
    17,194
    Location:
    Ottawa, Canada
    Little known fact... I'm told the Canadian Government's Tesla Roadster was instrumental in helping define the standard for MPGe, etc.
     

Share This Page

  • About Us

    Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.
  • Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


    SUPPORT TMC