How do you reset the number of EV miles?

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by SuperFun, Feb 17, 2020.

  1. SuperFun

    SuperFun New Member

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    I’d like to reset the number of EV miles shown for a full charge back to 11. The previous owner was only getting 7.7 and maybe used a lot of A/C. It’s creeping up but I’d like to start as high as possible.

    The only directions I’ve found have said to disconnect the 12V battery or unplug the white wire in the fuse box. But I don’t want to lose all my radio stations, blue tooth connections, XM login, etc.

    Is there a way to reset this without disconnecting the battery?

    If not what settings will you lose? Eg Bluetooth, XM, Trip odometers

    Thanks
     
  2. hieronymous

    hieronymous Member

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    Your car battery is 8 years old - you might not get 11 miles EV range because of degradation. The only way to tell is to fully charge then use it up completely in a test run, optimal conditions.
    I wouldn't bother trying to force a reset, it will adapt to your driving quite quickly.
     
  3. QuantumFireball

    QuantumFireball Active Member

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    Yes, disconnecting the 12V battery won't magically give you those miles back - it may report more miles, but it's just an estimation, and you're resetting the data for how it calculates the estimation.
     
  4. bisco

    bisco cookie crumbler

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    You can try an obd, but I don’t recall anyone ever doing it
     
  5. SuperFun

    SuperFun New Member

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    Update: I’m already up to 9.5 miles so it must use a rolling average (ie based on recent driving, not the total history of the vehicle). I like the suggestion of driving for optimal miles and seeing how high it goes. The car has low miles on it but the previous owner did a high percentage of EV miles and it’s 8 years old so it will be interesting to see battery degradation.
     
  6. hieronymous

    hieronymous Member

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  7. SuperFun

    SuperFun New Member

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    Did a test run, pretty optimal conditions. About 35 mph, few stops, slightly rolling hills or flat. No HVAC. Seat heater on high. Radio on. Headlights on. And got 11.8 miles. It will be interesting to see what the EV miles reads once it's charged up tomorrow morning.
     
  8. hieronymous

    hieronymous Member

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    Good result. Round trip?
     
  9. bisco

    bisco cookie crumbler

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    what was the outside temp?

    the daily doesn't change much, i'll guess .1 mile up
     
  10. SuperFun

    SuperFun New Member

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    Kind of a round trip. But a big circle. Not a there and back.

    This morning it read only 8.6 miles at start up. So a decrease. But it was only 39 degrees out. Whereas when it read over 9 it was warm out.

    I put it in HV mode to warm up the cabin. As I drove The miles dropped as low as 7.1 and went back to 7.8 before I put it in EV mode.

    I don’t know how many miles I actually got out of it because I used the EV miles off and on during my 21 mile commute.

    Being analytical I’d rather just have the display read state of charge instead of some nebulous miles the computer thinks I’ll get. I guess I’ll get an OBD2 scanner.
     
  11. jerrymildred

    jerrymildred Senior Member

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    You can largely ignore what the car says you will get for EV range. If you flog it, the actual range will be way less than predicted. If you drive intelligently, you'll probably go farther than predicted. That's all it is is a prediction based on previous driving. I usually thought of it as a score card for how efficient I was on the last drive. :D

    How far you actually go is an indication of battery health but will vary with driving style, weather, and speed. Anticipating stops and taking your foot off the "gas" early when traffic permits will do the most to increase range. Slower speeds make a big difference, too. And cold weather will reduce range.

    To know the actual battery capacity, you need a Killawatt meter or some other meter to measure how many kWh it takes to charge the battery from 0 EV range to full. It will show a little more than what actually goes into the battery due to heat loss, running the charger fan, and so on, but it reasonably close and you can see the trend as it ages.

    It is a bit of a shame that they didn't give the option to view SOC% rather than estimated miles. They fixed that on the Prime. I prefer the percentage, too, but when I'm almost out of EV range, the miles indicator can be handy.

    You can "stack" the EV miles this way. If you make a couple stops in quick succession or go down a hill in HV, you can put it in EV momentarily. When you go back to HV, that'll be the new SOC it'll try to maintain. It doesn't gain you anything as far as gas mileage, but it's kind of fun to play with, especially if you're anticipating some slow driving for a while and wan't more EV available for that.
     
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