Best Miles/kWh and MPGe Competition

Discussion in 'Clarity' started by AnthonyW, Aug 7, 2018.

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  1. AnthonyW

    AnthonyW Well-Known Member

    Many questions have come up regarding efficiency metrics and I thought it would be good if we started posting some of ours. I have done some research and have posted instructions on how to calculate mi/kWh and MPGe below. (If you see any errors please feel free to let me know). While MPGe is somewhat theoretical, miles per kWh is pretty cut and dry is a good measuring stick across all electric vehicles. For comparison purposes, miles driven must be in electric mode and kWh measurements must be "wall to wheel" (no adjustments for charging inefficiencies).

    To calculate mi/kWh and MPGe (in electric vehicle mode only):
    Step 1: Charge battery up to full
    Step 2: Drive and record mileage driven (with no ICE activity)
    Step 3: Charge battery up to full and record how many kWhs it took to charge
    Step 4: Divide step 2 by step 3 - this is your mi/kWh
    Step 5: Multiply Step 4 by 33.7 - this is your MPGe
    Step 5: post the following:

    -Type of Drive (i.e. City, Highway, Mixed)
    -Your charger Voltage/Amps (i.e. Level 2 240/32; Level 2 240/16; Level 1)
    -Your local high temperature (doesn’t have to be precise i.e...90’s)

    Guidelines and Notes:
    -For this experiment let’s do a minimum of 25 miles and the max is unlimited. Its okay if it take you a few days to reach the 25 mile minimum, just make sure you keep good records of the miles and kWh consumed.
    -During drive, do not allow ICE to come on. If it does start over at step 1.
    -There should be no adjustments for charging inefficiencies. It’s “wall to wheel” energy used and miles from your trip odometer. We can segregate and compare by the type of charger voltage/amp types. If you have a Level 1 charger you will need either a smart plug or a
    Killiwatt to determine your kWh’s consumed.
    -Canadians please convert kilometers to miles please.

    I will start if off:

    -4.38 mi/kWh (27.4mi, 6.26kWh)
    -148 MPGe
    -Mixed Driving
    -Level 2 (240/32)
    -mid 80’s

    Finally here are some benchmark/stock mi/kWh and MPGe figures for vehicles in all electric mode from (higher numbers are better):

    2018 Hyundai Ioniq PHEV: 3.53 mi/kWh 119 MPGe
    2018 Clarity PHEV: 3.26 mi/kWh 110 MPGe
    2018 Chevy Volt: 3.14mi/kWh 106 MPGe
    2018 Ford Fusion Energi PHEV: 2.88 mi/kWh 97 MPGe

    2018 Tesla Model 3 Long Range: 3.86 mi/kWh 130 MPGe
    2018 Honda Clarity EV: 3.38 mi/kWh 114 MPGe
    2018 Nissan Leaf: 3.32 mi/kWh 112 MPGe

    Eager to see what everyone else is getting!
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  3. insightman

    insightman Well-Known Member Subscriber

    Isn't a round-trip journey required to compensate for grade and wind?
  4. KentuckyKen

    KentuckyKen Well-Known Member

    You got me beat by one single MPGe.
    I used the Trip meter and ChargePoint app w Home 32 Amp EVSE
    Here’s my best summer MPGe:

    4.35 m/kW (51.4 m, 11.81 kW)
    147 MPGe
    Mixed driving, one person, ac set to 72 F, daytime, high 80s to low 90s. Charging temps in high 80s with no preconditioning.

    Here’s the metrics from my last 5 trips:
    192.7 miles, 47.09 kW
    4.35 miles/kW, 138 MPGe
    Same conditions but with some night and some rain and temps a little higher

    @insightman, if you use the same charger at start and finish, it must be a round trip (although not necessarily over the exact same route) and so takes care of elevation and virtually all the wind.
    Last edited: Aug 8, 2018
  5. insightman

    insightman Well-Known Member Subscriber

    After losing many (OK, every) hypermiling competitions in my Insight, I imagined someone (me) charging their Clarity PHEV on high and recharging down low to ace the competition. So how about a same-charger rule to compensate for grade? Wind changes won't affect the results as much as permitting non-round-trip routes.
    Kendalf and KentuckyKen like this.
  6. AnthonyW

    AnthonyW Well-Known Member

    Sounds completely fair to me.
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  8. bpratt

    bpratt Active Member

    I have been tracking mine since I purchased the car in late December 2017. My best was 4.52 miles/KWh and 152.46 mpge. My average the last few months since the temperature has warmed up is 4.01 miles/KWh and 135.13 mpge.
    Last edited: Aug 8, 2018
    insightman likes this.
  9. dstrauss

    dstrauss Well-Known Member

    I'm claiming the title based on this morning cool weather (68 in Midland is like a freeze in August). I started this morning with 54.1 estimated EV miles, fresh off the charger, and look at my remaining EV miles after my 5.5 mile drive to work - I GAINED 2.9 miles of EV range - guess that means I've joined Buzz Lightyear to infinity and beyond:


    Ha ha ha - I realize that's just the computer adjusting the estimated miles for the weather and better glide path this morning, but it is still a kick to end up with more total miles than I started...:p:D;)
    Last edited: Aug 9, 2018
  10. KentuckyKen

    KentuckyKen Well-Known Member

    @AnthonyW, @dstrauss ‘s downhill slalom run does suggest another rule for the contest.
    We are using actual miles from either the Trip Meter or the Odometer and not estimated miles from the HV range?
    How about this?:

    So here be the rules:
    -Use total kW from wall
    -Start with a full charge, no HV allowed, and any mid-route charging added to final charging
    -Must be a round trip, starting and ending at the same charger used for starting and ending charge
    -Must use actual milage from either the Trip Meter or the Odometer and not from the estimated EV Range. Trip Meter preferred since it’s in 10ths of a mile.

    You decide; it’s your contest.
    dstrauss and insightman like this.
  11. su_A_ve

    su_A_ve Active Member

    3.52 miles/kWh
    118.46 MPGe
    Mixed driving, AC set to 72 then 70
    Level 2 - I assume it's 32amps - took 2hrs exactly for 11.92 kWh
    Temp about 90

    It was a round trip with the exact same charger, but not the same route. One way included 14 miles of highway at about 65. Total of 41.9 miles.
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  13. AnthonyW

    AnthonyW Well-Known Member

    Yes, no problem at all. I assumed that everyone would use the trip meter. Definitely not the estimated HV. And round trip, same charger makes perfect sense.

    Sent from my iPhone using Inside EVs
  14. AnthonyW

    AnthonyW Well-Known Member

    Let's define one more metric that @kent335 asked about on another post: kWh/100 miles. Really simple conversion one you have the metrics computed above

    Step 6: To get kWh/100 miles: 100 divided by answer from Step 4.

    In other words divide 100 by your miles/kWh. So my best trip so far has been:

    -4.38 mi/kWh (27.4mi, 6.26kWh)
    -148 MPGe
    -22.8 kWh/100 miles

    -Mixed Driving
    -Level 2 (240/32)
    -mid 80’s

    Over all since I started tracking I am at:

    -4.21 mi/kWh (683mi, 149.7kWh)
    -142 MPGe
    -23.74 kWh/100 miles

    -47% Highway at 70 mph, 53% City/Stop and Go
    -64% Level 2 (240/32), 36% Level 1 (120/20)
    -Mid 80's to high 90's
    Last edited: Aug 15, 2018

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