Mileage until fill up display...?

Discussion in 'Gen 3 Prius Fuel Economy' started by Chalicekey, Jul 10, 2019.

  1. Chalicekey

    Chalicekey New Member

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    I have a 2010 prius 2
    The day I bought it and filled it up the range until fill up was up around 590 ish..
    Now when I fill it up it is around 418 to 420..?
    Does the calculated mileage prediction change based on my driving habits?
    I drive about 70 miles a day about 80mph + on the highway.
    Little bit of around town driving.
     
  2. bisco

    bisco cookie crumbler

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    yes. just multiply your mpg x gallons pumped. the car is figuring something similar.
     
  3. Chalicekey

    Chalicekey New Member

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    I was super pumped on that first fill up...
    590!!
    I guess the previous owner had a lighter foot?
     
  4. bisco

    bisco cookie crumbler

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    most likely. i drive slow and get around 600 displayed with a smaller tank
     
  5. fuzzy1

    fuzzy1 Senior Member

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    ... and also drove much slower, on a very different route.
     
  6. jerrymildred

    jerrymildred Senior Member

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    Yes. That's how it knows what to calculate. At 80+ mph, you're really chugging down the fuel.
     
  7. Grit

    Grit Senior Member

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    Your previous overall tank mpg will determine what the next DTE value displayed on the dash on next fill up. I once had 629 showed after fill up, but only got 510 driving 70 mph. 629 was inherented from my previous commute tank which came in at 63.2 mpg
     
    #7 Grit, Jul 10, 2019
    Last edited: Jul 10, 2019
  8. bisco

    bisco cookie crumbler

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    and keep in mind, it doesn't use the reserve in the calculation
     
  9. Triparadox

    Triparadox Junior Member

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    The heck? Is there a way to reset the MPG history used in the calculation for the fuel range? I think the previous owner treated Prius as some sort of racing car that when I top the gas tank, I am only getting around 350 miles range. Mine is 2010 Prius III btw.
     
  10. cnc97

    cnc97 Senior Member

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    As you use the display button to cycle thru all the different screens, hold the trip button to clear them. However, the distance to empty number is based lightly of fuel level, but more off of injected fuel volume over the last 500-1000 miles. To clear that is a 12v disconnect. Or just drive it a few tankfuls and it self corrects.
     
  11. Triparadox

    Triparadox Junior Member

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    No not that one. You see, you said the mile range of a full tank is measured by the driving habit as well (the MPG from past several hundreds or perhaps thousands of miles). I want to kind of reset that since the 350 miles max range is probably based on how horrible the previous owner drove this car.
     
  12. fuzzy1

    fuzzy1 Senior Member

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    How many tanks and miles have you driven since acquiring this car? It doesn't take all that much before it is showing how you have been driving it, not how the previous driver used it.

    Put another way, what MPGs are you getting? How many miles are you getting per refill, and how many gallons are you putting in on those refills?
     
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  13. jerrymildred

    jerrymildred Senior Member

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    That has no effect whatsoever on the actual distance to empty. It's just a prediction and it's rarely correct anyway. As you drive, it'll adjust itself on its own. But it's still just for entertainment. Just watch the gas gauge. :)

    Just for curiosity's sake, how many miles do you usually get from a tank?
     
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  14. cnc97

    cnc97 Senior Member

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    Yes, I did say the distance to empty is figured over the last several tankfuls. It does not use the consumption number the dash shows. It uses a number not shown to the driver. The fill-up (or adding at least 3 gallon)is only a trigger to the computer to reset it.

    It uses volume of fuel injected at the engine over distance traveled times programmed USABLE fuel volume. However the hocus-pocus the car does is a guess. The way the number gets better is by driving the car. If you disconnect the 12v, and drive how you normally drive, after 500-1000 miles that number will be within 12-15% of actual. I don’t think the number can get any closer then that. I could be wrong though.
     
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  15. Mendel Leisk

    Mendel Leisk Obtuse Angler

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    Yes.

    What I keep recalling with these threads: my parent's 58 VW had no gas gauge, and my Dad kept a stick under the hood, would occasionally take off the gas cap and check the level with the stick.
     
  16. Triparadox

    Triparadox Junior Member

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    Gas gauge? Also when I top of, it'll be around 350 Miles only.
     
  17. Triparadox

    Triparadox Junior Member

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    The mpg for the past 1,300 miles was around 44 I believe.. I have just got the car recently.. I have put about 1,500 miles..
     
  18. jerrymildred

    jerrymildred Senior Member

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    So if it's predicting 350 miles range and you're getting 350 from a tank, I can't see what's wrong (other than getting rather low fuel economy).

    Gas gauge. It's the thing that says approximately how much gas you have left.

    LOL! I remember lots of times on my old motorcycles, opening the gas cap and sloshing the bike back & forth to try to guess how much was left. :LOL:
     
    #18 jerrymildred, Jul 17, 2019
    Last edited: Jul 17, 2019
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  19. Mendel Leisk

    Mendel Leisk Obtuse Angler

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    The VW had a mechanical reserve, which is maybe better than the current situation. There was a lever under the dash, and if you were on the verge of running dry, turning that lever through 90 degrees would release some sort of floodgate in the tank, let you have a last pint or two. I would think that lever was directly connected, the gas tank was just beyond the firewall.
     
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  20. cnc97

    cnc97 Senior Member

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    I used to keep a two gallon can in an S-10 that I used to have. It’s gas gauge was broken, and I wasn’t willing to risk snapping the rusted tank strap bolts to repair it. LoL
     
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