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EPA MPGe ratings

Discussion in 'Tech Talk' started by MelindaV, Sep 16, 2016.

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  1. MelindaV

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    I've seen many Tesla owners state their mileage rate in traffic and at slow speeds is much better than at freeway speeds, so expect with most of my driving (a 26 mile RT in stop&go traffic that may peak at 40MPH) I would be getting better than the EPA rating... But find it curious that the EPA gives Tesla vehicles a less efficient rating for "city" driving than "highway" driving, like on a gasoline car.

    Here's my cars and a Model S 60D plugged into the EPA's MPG vehicle comparison with my current fuel/electricity prices, distance and city/highway info.
    Oddly, both of my gas cars real world MPG is quite similar to the EPA ratings, so should be a pretty true picture of them vs Tesla, and if my driving pattern stays the same, the Model ☰ should beat the EPA rating and saving at least $130/month over my current fuel costs (plus some SCing to bring it down a little more on trips)

    EPA MPG-MPGe.png

    Anyone else care to plug in their current car(s) and share?
     
  2. garsh

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    • Yanquetino

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      One can use the EPA's MPGe ratings to determine what I consider even more important: the miles-per-kilowatt efficiency in city, combined, and highway driving. When applying those calculations, we find that their corresponding ranges from a full charge are actually very different than what the EPA claims is the "total" range.

      For example, here are the 5 different MPkWh results from the EPA stats for the original Model S 60:

      [​IMG]

      It's not surprising that the Chevy Bolt achieves higher MPkWh from its 60 kWh battery, as it is a smaller, lighter car. Still, it is obvious that its EPA "total range" of 238 miles belies the real world results for city, combined, and highway driving:

      [​IMG]

      We'll have to see if the Model 3 will exceed those MPkWh numbers. I speculate that it will, thanks to better aerodynamics.
       
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      • KirbyTurbo

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        My fuel savings will be $71 a month.
         

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        • MelindaV

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          interesting that for the Leaf and the Bolt the city MPGe is higher than the highway, but not for the Tesla.
           
        • TrevP

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          It will be even cheaper to operate here where gas prices are over $4 US a gallon
           
        • Topher

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          The Leaf and Bolt are designed as city cars, small light, not great aerodynamics, the Model S is designed as a highway car, large, heavy, and aerodynamic. City energy losses are dominated by braking losses, so being light helps, Highway losses are dominated by air resistance, so being aerodynamic helps.

          Thank you kindly.
           
        • Mark C

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          No expert here, but the miles per kWh probably did not take into account the energy reclaimed due to regeneration. Had a ride Saturday in a P85 Tesla {National Drive Electric event} and when he lifted completely off the throttle, the regen went to 60%. Going along on a descending grade could put small amounts back into the battery as well. Don't know either, but EPA may have revised how they judged range from ~ 2011 to current specs given the addition al data they have to work from. A contributor on Green Car Reports, David Nolan had a Model S 60 that he claimed a real world range of greater than 200 miles. I believed him.
           
        • chopr147

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          I have a 2016 Model S and the 218 Tesla/EPA rating is very accurate. Having said that, the stop/go slow traffic is much higher than advertised. A couple Tesla owners have squeezed over 500 miles on a single charge staying below 20 mph I think it was. There are some yoytube videos on this
           
        • Topher

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          With solar panels on my roof specifically for car charging (i.e. installed cost, not avoided cost of the electricity), I get: (hopefully Model ≡ will be even better).



          X
          2016 Tesla Model S AWD - 60D
          X
          2007 Toyota Prius
          Personalize
          [​IMG]
          [​IMG]

          [​IMG]
          [​IMG]
          Add a Vehicle
          Automatic (A1) 1.5 L, 4 cyl, Automatic (variable gear ratios)



          EPA Fuel Economy
          1 gallon of gasoline=33.7 kWh
          Show electric charging stations near me
          Electricity Regular Gasoline
          Combined MPG:106 MPGe
          City MPGe:101 Highway MPGe:107
          combined
          city/highway city highway

          Combined MPG:45 MPG
          City MPG:48 Highway MPG:45
          combined
          city/highway city highway
          32 kWh/100 mi 2.2 gal/100mi
          [​IMG]
          226 miles
          Total Range

          [​IMG]
          536 miles
          Total Range
          MPG estimates for 2007 and older vehicles have been revised​
          View Original EPA MPG

          About All-Electric Cars
          Unofficial MPG Estimates from Vehicle Owners

          Learn more about "My MPG"
          Disclaimer
          User MPG estimates are not yet available for this vehicle
          Average based on 187 vehicles
          46.4 MPG
          34
          Lo
          75
          Hi
          [​IMG]


          View Individual Estimates
          You save or spend*
          Note: The average 2016 vehicle
          gets 25 MPG
          You SAVE
          $6,000
          in fuel costs over 5 years
          compared to the
          average new vehicle​
          You SAVE
          $3,750
          in fuel costs over 5 years
          compared to the
          average new vehicle​
          Annual Fuel Cost*$550$1,000
          Cost to Drive 25 Miles$0.70$1.22
          Cost to Fill the Tank
          $26
          Tank Size
          11.9 gallons
          *Based on 90% highway, 10% city driving, 20,000 annual miles and your fuel prices. Personalize.
          MSRP and tank size data provided by Edmunds.com, Inc.
          Range on a tank and refueling costs assume 100% of fuel in tank will be used before refueling.
           
        • MelindaV

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          this is exactly what I am hoping for out of my -15 mile / 70 minute commute!
           
        • KirbyTurbo

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          Riding a bike is faster than commuting via car
           
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