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Top 20 MPGe

Discussion in 'Gen 1 Prius Plug-in 2012-2015' started by markabele, Jul 1, 2013.

  1. giora

    giora Senior Member

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    It could well be
     
  2. markabele

    markabele owner of PiP, then Leaf, then Model 3

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    Possibly, but no one has ever been able to present the math so it's doable every time.
     
  3. giora

    giora Senior Member

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    Correct me if I'm wrong, but:
    EV miles divided by gallons saved gives "HV mpg". HV miles divided by "HV mpg" gives gallons used (as calculated from gallons saved).
     
  4. usbseawolf2000

    usbseawolf2000 HSD PhD

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    T
    That's how I would do. The HV MPG gives me close to my lifetime HV MPG.

    I think that's more accurate than potentially off by 0.499 gallon.
     
  5. giora

    giora Senior Member

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    Agree.
    The fact that 'EV miles/gallons saved' gives different results to different drivers means that gallons saved (precise to the tenth of a gallon) is personalized by the car computer.
     
  6. markabele

    markabele owner of PiP, then Leaf, then Model 3

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    I just tried it for several tanks of mine and the HV mpg was off by 20-50 percent. I think we came to the conclusion awhile back that this is a less accurate way of figuring HV mpg then the old "add 0.5"
     
  7. giora

    giora Senior Member

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    WOW this is one amazing result!
    about 158 charges in August! this is almost 6 charges a day on average! Any time to do something else?
     
  8. retired4999

    retired4999 Prius driver since 2005

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    That was from April 5th to August 29. :)
     
  9. fortytwok

    fortytwok Active Member

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    I don't know enough about the workings of that HV mpg read to say except that it seemed high by 15-20%. Consistently though, nothing like the 50% you mentioned - do you recall what the numbers on that one were ?
    You already know my opinion on the "add .5" - that one can be so far off just using a flat 53mpg is more accurate.

    Just look at Retired4999's latest - absolutely amazing result but 103miles and 1 gallon... going to 2g's in another mile or three... Using a flat 53mpg means that formula would use a more accurate 1.95 on that calc

    we're already making assumptions on the 15% charging loss, so to me a better assumption on gas used doesn't hurt
    just my opinion
     
  10. giora

    giora Senior Member

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    I thought so.
    However, in this post you said several days ago that you had a 500 miles round trip in August that was all HV.
    Since I did not see these 500 miles in your report I deducted the report is after this trip...
    Can you explain? was the trip done with another PIP?
     
  11. retired4999

    retired4999 Prius driver since 2005

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    I total agree, this is my HV mpg since new. HV miles 5202, 38 percent 50.89 HV mpg.
    I had 5 gas fills bring my car back from the west coast, winter temps time frame, cold windy, 65-75 mph, 26 degree temps and driving into 35 mph winds on left front of car, drove non stop so no charging at all. Only got 44.26 mpg for 1505 miles.

    Since then I have 3696 HV miles and averaged 54.19 mpg.

    So I guess If you were to average at 53.0 miles HV you would be really close!
    Don't you think? (y)
     
  12. retired4999

    retired4999 Prius driver since 2005

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    500 miles was total for my trip. I left home with out a full tank and I knew I did not have enough gas to get home, so while I was in northern Minnesota I filled up for my return.
     
  13. giora

    giora Senior Member

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    OK, I think I got it.
    Your trip to Minnesota was after your update of 29 August, Isn't it?
     
  14. retired4999

    retired4999 Prius driver since 2005

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    Yes
     
  15. giora

    giora Senior Member

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    Using flat 53 mpg would indeed be more accurate for the very high EV% driver, however I think it will hurt those with higher HV% that are achieving 60-65 mpg on HV (warm ICE, better regeneration etc.)
    What about a combination of the two:
    53 or 54 mpg for updates with only 0, 1, or 2 displayed gallons used, the "+.5 g" method for the rest?

    Just a thought.
     
  16. markabele

    markabele owner of PiP, then Leaf, then Model 3

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    You guys do realize that even in a worse case scenario for our original method compared to the new one you are proposing is only about a 3% difference in the final MPGe number? Chances are for most people it would be off by only 1 or 2%. Not to mention that for some people using 53 would lower their MPGe more than what it should be.
     
  17. fortytwok

    fortytwok Active Member

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    I think that's selective as well - the contest was for 1,000 minimum and many can't keep up a great tank for so long.
    Markable tried to keep this simple which is probably best.
    Plus there's an existing top 20 list - trash ? recalc ? Poor Retired4999 would have to start all over once Wisconsin winter ends next July :LOL:
     
  18. markabele

    markabele owner of PiP, then Leaf, then Model 3

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    You are correct. That is one of my biggest goals in this whole thing...to keep it very simple. And you are right...it would be a nightmare if we changed a big rule.
     
  19. retired4999

    retired4999 Prius driver since 2005

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    :ROFLMAO: Good one!
     
  20. retired4999

    retired4999 Prius driver since 2005

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    I do not really care myself! I just added the info. People were coming up with ideas. I just thought I would give my two cents!
    I vote to keep things just as they are! (y)
     
    markabele likes this.