10% drop in Prius v mpg after new tires and fuel injector service

Discussion in 'Prius v Fuel Economy' started by carlben, Mar 13, 2019.

  1. carlben

    carlben New Member

    Joined:
    Mar 13, 2019
    1
    0
    0
    Location:
    maryland
    Vehicle:
    2016 Prius v wagon
    Model:
    II
    I drove my 2016 Prius v on a 20,000 mile trip to 30 national parks in 2017 and averaged about 42-43 actual mpg (I calculated it rather than just believe what the meter said which was 5% higher) even driving a lot in mountains, and that kind of acceptable gas mileage continued up until i got a 50,000 service, meaning I was getting up to about 45mp on average in optimal driving conditions, 41 mpg on on average at high speeds (70mph). The 50,000 mile service included putting on new tires (4 DT003-23460-YK-Yokohama Avid Ascend) which is what the dealer recommended, sizeP205/60R16 91H. I don't know the size of the original tires (I bought the car new). I have always kept my pressure at 35 front/37 back and checked in often. The 50,000 service also included a Fuel Injector and Throttle Body Service. Just after that I began another 10,000 trip through New England and the Maritimes of Canada and immediately noticed a substantial drop in gas mileage. I now was getting about 37mpg at high speeds and around 40 in optimal conditions, which has continued ever since. So at my next oil change I asked Toyota to figure out what had happened (i was now in Orlando FL, not the same place I had the 50,000 mile.) They said that they recommended a different Fuel Injector Service than the one I got at 50,000 mile and they thought might help - BG Induction Service, Clean Throttle Plate, so I had them do it. On the drive back from the Dealer, it did seem to help because for the first time since the 50,000 service ( according to the meter), I was seeing my mpg back where they used to be, but then it just reverted back to the lower mpg numbers the next time I drove. The Toyota dealer who did the most recent service said they could see no reason for the 10% fuel drop other than that the previous fuel injection service at 50,000 was not the one they recommend, which is why we did the second one. My driving now is 90% around town in Orlando. Very little high speed driving, and I am only getting around 40mpg actual mileage, if that. Any thoughts or suggestions. Thank in advance for any help.
    Carl
     
  2. hchu1

    hchu1 Active Member

    Joined:
    Sep 28, 2006
    308
    122
    0
    Location:
    Houston, Tx.
    Vehicle:
    2014 Prius v wagon
    Model:
    Two
    Your OEM tires probably had a different tread pattern, but the size is the right size. Brand new tires will cause you to have lower gas mileage initially, they need to be broken in for best mileage. This could take over a 1k miles or more, but it certainly should be broken in by 10k.

    Your air pressure could be higher for better mpg, I have mine set at 44fr/42r. That's at the high end and will result in stiffer ride comfort. I have acclimated to this and it's a none issue. I get about 50mpg on the Bridgestone Ecopia EP422 I got from Costco.

    The fuel injector and Throttle Body Service I've never had from the dealership, so I can't speak to that item.

    Your drive pattern has also change from your previous pattern so that will have some affect on mileage. My driving is in the Houston metro area with a mix of freeway and suburban driving as a comparison.
     
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