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Ton - Miles / kwH Metric

Discussion in 'Technical' started by Owner, Jan 17, 2013.

  1. Owner

    Owner Active Member

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    I have been calculating metrics on electric car efficiency on my blog. Ton - Miles / kwH seems like a good metric to judge the engineering efficiency of the car. It isn't as practical as a day to day MPGe or Miles / kwH, which I prefer. But it does provide an insight into the engineering built into the car.

    tonmileskwh.jpg

    Thoughts?
     
  2. jdh

    jdh Member

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    Don't you think the 60KWh version will be lighter than the 85KWh, at least partially accounting for the increase in MPGe?

    If you were to assume the same Ton-Miles/KWh for both models, then the 60KWh should weigh 4280lbs (367lbs lighter).

    I guess we'll see when Tesla publishes the curb weight for the 60KWh model, or someone takes delivery of one and takes it to the scales.
     
  3. Owner

    Owner Active Member

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    I agree the weight of the 60kwH will be lighter. But I haven't seen an official number. Where did you get your 367 lb number?
     
  4. jdh

    jdh Member

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    My 367lb number was based on your table assuming equivalent efficiency at Ton-Miles/KWh for both models. I just solved for X where Ton-Miles/KWh = 6.11 and KWh/100 Miles = 35
     
  5. ItsNotAboutTheMoney

    ItsNotAboutTheMoney Active Member

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    Ton-miles really isn't a good measure when you include the car. What matters are passenger-miles or cargo-miles. Or maybe fun-miles.
     
  6. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

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    Aren't fun-miles 90%+ ?
     
  7. Owner

    Owner Active Member

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    Ah, reverse engineering based upon the Mpge numbers in effect. I'll wait to update the table when the actual numbers are released, and they will probably be very close!
     

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