Prime - Charge Mode Experiment

Discussion in 'Prime Fuel Economy & EV Range' started by Optimus PRIME, Jan 12, 2018 at 10:52 PM.

  1. Optimus PRIME

    Optimus PRIME Active Member

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    Had a long drive home tonight and noticed that my gas tank was getting pretty low, at about 1 bar left. I had 29 miles to go with lots of hills, and the computer shows 47 miles left on gas.

    Decided to use the Charge Mode, my 2nd time using it, to see how much I can get on EV before my gas tank runs dry. It took a little over 30 minutes to charge to 80%, and by the time I got home, I had 5 miles left on Gas, and 23.8 miles left on EV with 84% charge.

    It was a cool experiment for me, as I was able to build up that 80% charge for just in case I needed that extra 20+ miles to get to a gas station.

    So here are my two thoughts:

    1. How many of you have used Charge Mode? And does anyone know how much gas and how efficient is it to convert from gas to electric using this method? Obviously, for me it was less than ideal since I was driving through hills, so I wonder how ideal it would be on relatively flat roads.

    2. I was wondering ... my current average mileage is about 650 miles for full gas/battery and I charge every night to the fullest and try to maximize my EV usage whenever possible by switching between EV/Auto/HV modes manually. But what if I start driving FULL using EV/Auto, and then engage the Charge Mode to build it back up to 80% and then go EV/Auto again, and repeat this process over and over. I wonder how much mileage we can get using this method? Has anyone tried this?

    Thanks in advance.
     
  2. Tideland Prius

    Tideland Prius Moderator of the North
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    Calling @bwilson4web and @Charged Up . They've both done experiments and have documented it.

    Also, here's a challenge if you want a target to aim for. He did use the CHG mode during the trip. Note the lower speeds (so no highway speeds)

     
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  3. JamesBurke

    JamesBurke Senior Member

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    @bwilson4web suggested using charge mode to convert your last bit of gas to electric as part of his run it out of gas tests. If you have charge you can use the heat pump, keep your cell charged, get news from the radio run an inverter off the hybrid battery ect. Don't remember the ICE restart procedure if you really did run it out of gas.

    @john1701a did some charge mode test on his interstate drive to Wyoming. Recall it was about the same mpg as hybrid mode driving at those speeds overall but again you end up with ev range/charge that might have other benefits in a given circumstance.

    Still better to plugin if you can. Somebody will point out that you might have switched to EV when you had charged enough to get you home instead of all the way to 80% but you were just doing an overall test.
     
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  4. bwilson4web

    bwilson4web i3 and Prime

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    If not perfect, close enough. When the low gas light comes on, you have about 1 gallon of gas remaining. This is more than enough to put an 80% charge on the battery which becomes the "reserve" range. The electric metrics for miles remaining is so much more accurate than the gas 'guess-o-meter' that you can handle the last miles sensibly.
    Sad to say, possible does not mean practical. Our Prime engine at 40% efficiency, similar to current thermal generators, is still saddled with expensive fuel, gasoline. Coal, nuclear, and renewables are so cheap that getting the energy from the grid (with the exception Boston or a Blink charger) is cheaper, half the price per mile. The perfect profile is:
    1. Drive EV from the charger until done when the car switches to hybrid.
    2. Drive in hybrid until the low fuel light comes on and switch to CHARGE mode.
    3. Drive until the gas engine stops and the car is in EV mode by monitoring the SOC or EV miles remaining.
    4. Use the last reserve to reach a charger or motel or gas station or safe place to wait while AAA to brings gas.
    Bob Wilson
     
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  5. Stever56

    Stever56 New Member

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    I will use the charger when I'm running down hills that are somewhat steep. Running charger on flat get you 40mpg approx

    Posted via the PriusChat mobile app.
     
  6. Andyprius1

    Andyprius1 Senior Member

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    I generally use ICE charge to get the car up 3 large hills and recharge to the bottom of the American River Canyon. Now begins another hill climb and hopefully enough charge to make it home in EV. Mild Winter here, so home charge is only 22-24 miles. Vs in Summer 30 miles. I want to see if i can get 1000 miles on a tank. It looks like no problem thus far. My daily trips include freeways at 55mph, 50% and mountainous, also about 50%.
     
  7. Optimus PRIME

    Optimus PRIME Active Member

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