My 2018 Prius Three is draining gas FAST

Discussion in 'Gen 4 Prius Fuel Economy' started by Chime, Aug 31, 2018.

  1. Chime

    Chime New Member

    Joined:
    Aug 31, 2018
    19
    23
    0
    Location:
    SF Bay Area, California US
    Vehicle:
    2018 Prius
    Model:
    Three
    I need help. I just purchased a new 2018 Prius Three, it has 427 miles on it so far. But within a week of driving the car already, I've had to fill up my gas tank 3 times within those 427 miles. Also my indicator is giving me scores of 77-93 ECO driving and saying I'm reaching 80 MPG. I do not know if these indicators are wrong or if something is wrong with my Prius. I found myself filling up this car way more than I filled up my 2016 Nissan Altima I traded for this Prius.

    It takes me roughly 22.4 miles round trip to get to work and back each day. And by the time I get home at the end of the day, half a quarter of the tank is already drained.

    I thought the point of the Hybrid was to save on gas money not to spend more; which I currently am. Is anyone else experiencing this problem?

    1535770667970.JPEG
     

    Attached Files:

  2. alanclarkeau

    alanclarkeau Senior Member

    Joined:
    Feb 24, 2016
    5,892
    6,460
    0
    Location:
    near Brisbane, Australia
    Vehicle:
    2016 Prius
    Model:
    N/A
    Did you fill the tank when you first got the car? Dealers will often "top it up" so it looks full - but if you take it to fill up, it'll still take a good few dollars.

    Only ever fill till the first click on the pump. I've had a couple of pumps which click off when I'm fairly sure it isn't full - expecting to put $40 in, but stops at $25. Pump problem, unfortunately.

    You say you've filled 3 times - can you list how many gallons you've put in each time?
     
    HPrimeAdvanced, RCO and Prodigyplace like this.
  3. ykbj

    ykbj Junior Member

    Joined:
    Jun 17, 2018
    21
    18
    0
    Location:
    Toronto
    Vehicle:
    2018 Prius
    Model:
    Technology
    These car are all made in Japan so QC should be out of the question. Prius is also the flagship car of Toyota hybrid line-up. The only reason why people are getting worse mileage is mostly, imo, heavy foot and/or extreme prolonged period of blowing AC with gas.

    So my suggestion for you is to go as long as you can with a single tank of gas til it hits with probably DTE 50km (~30mile). Let the computer learn your driving habit. Second, adjust AC accordingly. You don't have to put priority AC on. ECO AC is a must tho. And you should always try to score at least 4 out of 5 stars. Lastly, hand calculate the mileage yourselves. Mark the current odo. Fill up the tank to FULL, reset trip A, drive until half a bar of gas left, then fill up again. Now write down your previous Trip A range, the amount of gas you have filled up. And there you have it, your MPG. Rinse and repeat.

    Fuelly is a good website to track all of your gas mileage and the above info is all you need to add a fuel-up.
     
    HPrimeAdvanced and Mithrandrost like this.
  4. Starship16

    Starship16 Senior Member

    Joined:
    Jun 8, 2018
    1,348
    1,433
    0
    Location:
    Beach Christmas
    Vehicle:
    2016 Prius
    Model:
    ----USA----
    Three fill-ups within 427 miles. I don't believe that. COMPLETE fill-ups?
    The engine would have to be running 24/7.
     
    #4 Starship16, Sep 1, 2018
    Last edited: Sep 1, 2018
    orenji, HPrimeAdvanced, dubit and 2 others like this.
  5. RCO

    RCO Senior Member

    Joined:
    Aug 31, 2016
    3,708
    5,156
    0
    Location:
    Cornwall
    Vehicle:
    Other Hybrid
    Model:
    N/A
    Alan's right, that's far too much refueling for a Prius, so something's not quite right. Do you always use the same pump to refuel, or different pumps? You need to record the number of gallons at each fill-up and note the mileage traveled. Pen and paper of a spreadsheet will give you the exact mpg. If it is greatly different from the indicated mpg, I suspect a fuel leak . Is there ever a strong smell of gas outside the car when the engine is running?
     
  6. Salamander_King

    Salamander_King Senior Member

    Joined:
    Nov 8, 2015
    5,835
    4,550
    0
    Location:
    New England
    Vehicle:
    2020 Prius Prime
    Model:
    LE
    If true, you are using about 1.5 gal of gas for 22.4 miles drive, or ~15mpg. The number is in agreement with needing 28.4 gallons of gas for 427 miles of driving or 3 fill-ups in that short distance. If this is all true, you have a major problem. Something is really, really wrong with your brand new car. I would take it back to where you bought it and complain. Just make sure you can document how much gas was filled and what odometer reading it was to be able to calculate gas mileage. Keep us informed what you find out at dealer.
     
    HPrimeAdvanced, alanclarkeau and RCO like this.
  7. sam spade 2

    sam spade 2 Senior Member

    Joined:
    Mar 31, 2018
    3,112
    1,405
    0
    Location:
    USA
    Vehicle:
    2017 Prius c
    Model:
    Four
    Nowhere in your post did you tell us how MUCH you are putting in the tank at each fill.
    You need to log the MILES DRIVEN and divide that by the GALLONS USED to get a real "miles per gallon".

    For the moment, you should forget all of those numbers on the displays. THIS PART IS IMPORTANT.

    And.....you mentioned a "half a quarter" (one eighth) on the gas gauge.......but didn't mention where the gauge is when you feel a need to fill it up.

    Your car is under warranty. If there really is a problem, take it in.
    BUT you need some better data first.
    It might be that your gas gauge is just off a bit.
     
    HPrimeAdvanced and Starship16 like this.
  8. The Professor

    The Professor Senior Member

    Joined:
    Apr 5, 2018
    471
    626
    0
    Location:
    UK
    Vehicle:
    2017 Prius
    Model:
    Excel
    Something is not right if they're full fillups. I get around 500 miles out of a full tank. Bear in mind the Prius does have a very small tank for the size of the car.

    I suspect either the fill-ups aren't truly filling the tank, and/or aren't starting from nearly empty... i.e. not much fuel is going in, or the fuel gauge is faulty and telling you the tank is close to empty when it's not.

    Also make sure you're not using B mode. There's a lot of false information out there around using B. Some people think it means B for Battery Charging. It actually means B for (Engine) Braking, and you lose energy to heat instead of that same energy being used to charge your battery.
     
    HPrimeAdvanced likes this.
  9. Lucifer

    Lucifer Senior Member

    Joined:
    Aug 23, 2015
    1,011
    479
    0
    Location:
    Nh
    Vehicle:
    2017 Prius Prime
    Model:
    Plug-in Advanced
    1/8th a tank for 22 miles, at what speed?
     
  10. The Professor

    The Professor Senior Member

    Joined:
    Apr 5, 2018
    471
    626
    0
    Location:
    UK
    Vehicle:
    2017 Prius
    Model:
    Excel
    Actually doesn't matter... 1/8th of the tank on the gauge is not 1/8th of the tank, nor is one 8th on the gauge the same volume as any other 1/8th as the gauge is not linear. In general, an 1/8th when the gauge is full is a lot more than an 1/8th towards empty.
     
  11. Chime

    Chime New Member

    Joined:
    Aug 31, 2018
    19
    23
    0
    Location:
    SF Bay Area, California US
    Vehicle:
    2018 Prius
    Model:
    Three
    Just woke up. To answer some questions,

    I travel between 65-75 MPH going to work on the HWY. It takes 22.4 miles round trip.

    As far as gas fill-ups, yes they've all been full fillups. I try to go back to the same station if possible, which I've been using Chevron. Just yesterday I filled the tank to full after driving out of San Francisco and heading back home, I was in my neighboring town called Antioch, which is about 9-10 miles from my house. So within those 9-10 miles of driving on a FULL tank, the gas gauge already depleted down to half of the first bar within those miles.

    There is no gas smell, and everything else for the car is great. I'm not blasting the A/C, and I'm not driving like a maniac. I've been for the most part reading the manuals and trying to get the most mileage out of the car. I tried switching to ECO mode for 2 days to see if that made a difference, and I noticed in ECO the gas seemed to have depleted even faster than me driving it in Normal mode. For the first week of me driving this car I've spent more in gas than I did on my previous car. So something is def. wrong with it.

    I'll take a look at my trips and miles traveled that were saved in the trip log of the car and put a screenshot after I'm off work.

    I can also say I started with a full tank heading into San Francisco and came back with below half a tank; which was only 82.3 mile round trip distance. Less than 100 miles and it's below half a tank. It made me pretty sad.

    I'm taking it back to the dealer to complain and get checked out tomorrow morning.
     
    #11 Chime, Sep 1, 2018
    Last edited: Sep 1, 2018
  12. Salamander_King

    Salamander_King Senior Member

    Joined:
    Nov 8, 2015
    5,835
    4,550
    0
    Location:
    New England
    Vehicle:
    2020 Prius Prime
    Model:
    LE
    Yeah, there is something wrong with your car. With my Prime, even when EV range is depleted, driving as hard as I can on hwy at 75mph+, I can not get below 40 mpg. 4Gen Prius should get at least 50 mpg easily. Please keep us updated. I am curious what is going on with your car. And Good luck.
     
    HPrimeAdvanced and RCO like this.
  13. sam spade 2

    sam spade 2 Senior Member

    Joined:
    Mar 31, 2018
    3,112
    1,405
    0
    Location:
    USA
    Vehicle:
    2017 Prius c
    Model:
    Four
    AND......after taking the time to type ALL of that.............
    You still did not actually calculate the Miles Per Gallon.

    Without that, over several fill-ups, you will be wasting your time going back to the dealer.
    BECAUSE they will just hook up their little computer and say "No codes set. Nothing wrong."

    YOU HAVE TO PROVIDE SOME ACTUAL EVIDENCE and NOTHING you have said so far really means anything solid.

    So, let's try one more time:
    For this discussion to be fruitful, either with us or with the dealer, you MUST record how many gallons you put in at each fill and how many miles you drove since the last fill.
     
    HPrimeAdvanced, dubit and Starship16 like this.
  14. RCO

    RCO Senior Member

    Joined:
    Aug 31, 2016
    3,708
    5,156
    0
    Location:
    Cornwall
    Vehicle:
    Other Hybrid
    Model:
    N/A
    Ok, there's obviously something wrong and you're doing the right thing taking it back to the dealer. Don't be offended by post #13 as the author often 'shoots from the hip' and doesn't empathise very well. However, IMHO he always means very well and he's not stupid.
     
  15. Mendel Leisk

    Mendel Leisk Senior Member

    Joined:
    Oct 17, 2010
    39,329
    27,979
    80
    Location:
    Greater Vancouver, British Columbia, Canada
    Vehicle:
    2010 Prius
    Model:
    Touring
    Are you parked outside? Maybe someone has figured out how to siphon gas from a fourth Gen??
     
    HPrimeAdvanced likes this.
  16. Chime

    Chime New Member

    Joined:
    Aug 31, 2018
    19
    23
    0
    Location:
    SF Bay Area, California US
    Vehicle:
    2018 Prius
    Model:
    Three
    "I'll take a look at my trips and miles traveled that were saved in the trip log of the car and put a screenshot after I'm off work."

    ^^^ If you read that in my reply post. I am going to calculate and log my miles today while driving it to give some numbers later.This is my first Hybrid car. I didn't think I needed a log and to record every mile I take as I thought the meaning of owning one was to make mileage and savings simpler. I'm not one for tracking every inch of a mile but I do want to drive this car right and take good care of it.

    I'll give my numbers later tonight when I'm home.
     
  17. Starship16

    Starship16 Senior Member

    Joined:
    Jun 8, 2018
    1,348
    1,433
    0
    Location:
    Beach Christmas
    Vehicle:
    2016 Prius
    Model:
    ----USA----
    Can I drive your car? I can be up there in about 5 hours. ;)
     
    HPrimeAdvanced likes this.
  18. Starship16

    Starship16 Senior Member

    Joined:
    Jun 8, 2018
    1,348
    1,433
    0
    Location:
    Beach Christmas
    Vehicle:
    2016 Prius
    Model:
    ----USA----
    Nah, they have banned straws in California... and rubber hoses. :ROFLMAO: (y)
     
  19. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    87,536
    38,964
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    i won't use the t-word.:rolleyes:
     
  20. Starship16

    Starship16 Senior Member

    Joined:
    Jun 8, 2018
    1,348
    1,433
    0
    Location:
    Beach Christmas
    Vehicle:
    2016 Prius
    Model:
    ----USA----
    Maybe one of the nice Priuschat members in the Bay Area can meet up with her, and assist with her car. A simple test drive with an experienced Prius owner.
     
    #20 Starship16, Sep 1, 2018
    Last edited: Sep 1, 2018
Loading...