Interesting MPG after EV range was gone . . .

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by janie, Sep 10, 2012.

  1. janie

    janie 2016 Prius 3 Touring

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    Yesterday, after arriving at a charging station that was being used by a leaf . . .With zero EV range left, I drove to a different charging station which was about 10.5 miles away (on city streets instead of the freeway). When I arrived at the next charger station, and powered off the car, it showed that I had gotten 100 mpg for the 10.5 miles driven.

    I am curious, how does this happen? Any thoughts? Has anybody else experienced this phenomenon?
     
  2. priuskitty

    priuskitty PIP FAN

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    While you were arriving at the first charging station you had some EV left, then when driving to the next charging station you used a combination of EV (left over from first trip to first charging station) and HV to the 2nd charging station. You probably didn't turn off your car at the first charging station.
     
  3. Jason dinAlt

    Jason dinAlt Member

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    Question: if you had ignored the charging station, and not driven the 10.5 miles to find one, but rather had just completed your errand and driven home - would you have used more or less energy, total?
     
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  4. ultraturtle

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    Assuming priuskitty's assumption is correct, the math is certainly reasonable. Taking a conservative estimate of 12 miles EV before depletion and adding your 10.5 HV drive, 22.5 miles at 100mpg means the car calculated that you actually consumed 0.225 gal for the whole trip. 10.5 miles burning 0.225 gal is 46.7 mpg, very reasonable performance for HV mode.
     
  5. priuskitty

    priuskitty PIP FAN

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    I drove home from an EV show in June total miles for the trip was about 26.5 miles, during the trip I had 10.9 miles EV, was in HV on I696 when I got within 10 miles from home I switched to EV, final avg. mpg 100mpg.
     
  6. John H

    John H Senior Member

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    Somebody has a case of Plug Envy :)
     
  7. rockerdan

    rockerdan PiP Rocks!

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    OP....did you turn car off at first stop? Or did you continue on without powering off? If you did not power off your car is averaging the total MPG including the EV miles PLUS the HV miles.

    I know if I go 20 miles, which would be 13EV approx plus the remaining HV, the MPG is still very high, usually over 100mpg. Since you are starting with 999MPG, it take several miles to get the MPG down to 100s.

    Or you simply may have been going slower where the battery still has the HV amount remaining so at lower speeds you can still go into EV below 34mph or so.

    Dan
     
  8. janie

    janie 2016 Prius 3 Touring

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    Yes I did turn off my car at the first stop/charging station (I was about 35 more miles from my final destination). During the stop, I was thinking about whether or not to wait to see if the leaf owner would return so I could use the charger, but finally decided it was best to look for another charger along my route to my final destination.

    And, I did check one other possible station that was on the plug share app, that I could not find along the way to the known charging station. But, as I pondered, it is possible that I might have had about .8 miles of EV range left as I started on the 10.5 miles drive to the next station. Also, I drove on city streets so that I could drive slower than if I were on the freeway.

    Yes, I know, I am a bit OCD about trying to get charged up along my route, and I make the most of the time when I am waiting for the charging- by eating a meal, or reading , or running errands, or whatever else I need to do during the charging. I drove about 140 miles this weekend, and I was able to increase my MPGe, because I stopped at as many free charging stations that I could stop at. Typically on a weekend trek of that many miles I lose about 20 to 30 MPGe, because I don't stop at so many charging stations. But this time, I did it because I wanted to increase the MPGe because on my last tank of gas I had to drive long distances without charging, and got my lowest recorded MPGe, which was 92.3. Current tank of gas is 207 MPGe, after driving 470 miles, and that is my highest average thus far :)
     
  9. ryogajyc

    ryogajyc Active Member

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    I think you mean the consumption MPG, since it would be impossible to get such high MPGe if you burned any gas. To get 207 MPGe, you'd have to drive 17.8 miles per full charge using no gas. As soon as you start using gas, MPGe drops drastically.

    Miles per gallon gasoline equivalent - Wikipedia, the free encyclopedia
     
  10. janie

    janie 2016 Prius 3 Touring

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    Hmmm - I am not sure, but now that I look at the dash, it does say Cons. 207 mpg. LOL - I thought that the 207 was referring to MPGe which I thought meant gas plus electricity :)
     
  11. ryogajyc

    ryogajyc Active Member

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    Consumption MPG = miles/gallons of gas.
    MPGe = miles / (gallons of gas + kWh/(33.7kWh/gallon)), which is not calculated automatically for you.
     
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  12. chesleyn

    chesleyn Active Member

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    My EVSE has been away for the past week at evseupgrades.com -- turning it into a 120/240v. I am using mostly fuel these days to get around and my mpg is closer to 60. How funny we are used to getting much higher with our PiPs and 60 just seems kind of pathetic to me.

    I've been cringing on short trips when the ICE turns on. Such a waste of fuel.
     
  13. hill

    hill High Fiber Member

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    You may be presuming the OP didn't have to drive that same 10 miles. I think the question had a different purpose. SOME will drive 50 miles around a hill, rather than 20 miles up & over a hill, simply to get 15%-20% better mpg. In the long run, the pay off is a negative, even though your mpg readout stays nice and high. I'm not saying it happened w/ the OP, but it does happen with some folks.