Are people really getting 40+ MPG in Gen 2?

Discussion in 'Gen 2 Prius Fuel Economy' started by timmyjane, Apr 12, 2017.

  1. Kaptainkid1

    Kaptainkid1 Member

    Joined:
    Mar 13, 2019
    125
    100
    0
    Location:
    Los Angeles
    Vehicle:
    2009 Prius
    Model:
    III
    I finally got a baseline of 44 mpg on my 2009 Prius after 6 months of ownership, she has 170k now with original Hybrid battery. I tested the battery with Torque app and confirmed the battery 28 packs were in good to above avg condition. I drove the in stop and go traffic of Los Angeles with a roof rack for over 6 months and really couldn't get above 34 mpg at best. I was seeing average tank around 30mpg for 10x fill ups. Even though I changed my PVC valve, engine Oil, Tranny Oil(OEM ONLY), New tires, Spark plugs, checked starter 12v battery in trunk, everything checked out ok. So one of the changes which made some difference was installing a Oil Catch can from the engine PVC valve to the throttle body. I noticed oil droplets at the bottom of the throttle body, so a cheap mod and $30 dollars for part and free installation, she was running a little cleaner. I noticed after taking a 200 mile trip to San Diego the oil catch can made a huge difference to my highway MPG. I was getting 40mpg now with the AC on. Just after 3000 miles the oil catch can was 1/6 QT full of oil. I've read the oil catch can works best when the engine is on and above 3500 rpm, which means people who do a lot of highway driving and above 55 mph will see the most benefit from this mod. It's seem the engine produces more oil vapors at high RPM's and is sucked down into the throttle body. Honestly, if I'm cutting the oil burning and keeping the environment a little cleaner, its all worth it.

    That got me to thinking the few droplets made an impact to my poor gas mileage, because my other long road trips I was seeing 35-37mpg with AC on at best. So I noticed my city driving I was still getting around 30-33mpg with the AC running all the time. So I decided to run a baseline test with a full gas tank and drove my tank empty today after 370 miles and two weeks of driving without the AC in LA traffic was insane. 90 degree days and stop and go madness and hypermiling when ever possible. I was able to achieve 44 mpg wow. I was excited at best now I know my Prius can get the average miles other Prius we're getting. So I now know it's all about the AC, Hypermiling and keeping up with maintenance.
    Special note: All MPG number we're done manually, I noticed Prius Dash showed me different MPG average number. It read 40.1 even though I put in 8.4 gallons of gas got 370 miles. So it's best to keep track manually when coming up with my baseline.

    Here is my oil catch can set up:
    [​IMG]

    Here is the oil after 2000 miles of driving:
    [​IMG]

    Here is the oil droplets in the throttle body before oil catch can:
    [​IMG]

    Here is a picture after running the oil catch can 2000 miles:
    [​IMG]
     
    #261 Kaptainkid1, Aug 28, 2019
    Last edited: Aug 28, 2019
    ydpplqbd, dpower and bisco like this.
  2. bisco

    bisco cookie crumbler

    Joined:
    May 11, 2005
    89,442
    40,014
    0
    Location:
    boston
    Vehicle:
    2012 Prius Plug-in
    Model:
    Plug-in Base
    well done (y)
     
  3. Data Daedalus

    Data Daedalus Senior Member

    Joined:
    Jul 6, 2013
    976
    1,111
    0
    Location:
    Wembley, London
    Vehicle:
    2008 Prius
    Model:
    II
    IMG_0094.jpg

    Pulled into my local refuelling station 18th August with my fuel depletion warning light flashing. I’d managed 623 miles on 44.1 litres of fuel (the amount I put back in) and with 64.5mpg (UK) on the MFD.
    That’s 53.7mpg US.
    Was mighty pleased.

    The hot spell of weather in London had a lot to do with that no doubt, and all miles were from my daily commute - no motorway driving


    iPhone 6s +
     
    jerrymildred and dolj like this.
  4. dolj

    dolj Senior Member

    Joined:
    May 14, 2012
    4,746
    2,566
    0
    Location:
    Wellington, New Zealand
    Vehicle:
    2006 Prius
    64.5 MPG (UK) is 4.4 L/100 km and your actual 44.1 L/1002.62 km works out to be 4.398 L/100 km. In imperial: 623 miles used 9.7 Imp gals = 64.2 MPG (UK).

    So, your indicated is very close to spot on.
     
    ydpplqbd and Data Daedalus like this.
  5. Zeppo Shanski

    Zeppo Shanski Active Member

    Joined:
    Feb 5, 2019
    219
    117
    0
    Location:
    Chicagoland
    Vehicle:
    2005 Prius
    Model:
    Base
    After reading this last nite I checked today. I've still got 2 pips so I won't be getting a fill up for a coupla more days. My last reading was 52.1 mpg as of earlier this evening.


    2005 Gen2 Prius ... +/- 148,000 clicks.


    IMG_0664.JPG
     
    Data Daedalus likes this.
  6. Data Daedalus

    Data Daedalus Senior Member

    Joined:
    Jul 6, 2013
    976
    1,111
    0
    Location:
    Wembley, London
    Vehicle:
    2008 Prius
    Model:
    II
    Thank you for calculating that, dolj

    Highly appreciated.


    iPhone 6s +
     
    dolj likes this.
  7. Therk

    Therk New Member

    Joined:
    Dec 14, 2019
    5
    2
    0
    Location:
    NZ
    Vehicle:
    2008 Prius
    Model:
    II
    Bought a 2008 Gen 2 Prius with 73k (45k miles) a couple of months ago and I'm currently managing 23.7 km/l (about 56 MPG US) which I'm quite happy with compared to my Mark X which was using almost 3 times the fuel!
     
    Data Daedalus and bisco like this.
  8. mubex

    mubex Junior Member

    Joined:
    Jul 1, 2018
    5
    6
    0
    Location:
    Puerto Rixi
    Vehicle:
    2012 Prius
    Model:
    ----USA----
    Data Daedalus and bisco like this.
  9. Lobsterbate

    Lobsterbate New Member

    Joined:
    Mar 9, 2020
    3
    5
    0
    Location:
    Santa Rosa
    Vehicle:
    2007 Prius
    Model:
    Five
    200,200 miles here reaching 47mpg average after 300 or so miles of a tank.
     
    Data Daedalus and ydpplqbd like this.
  10. Gen2_Accel

    Gen2_Accel Junior Member

    Joined:
    Nov 9, 2018
    12
    5
    0
    Location:
    New Holland, PA
    Vehicle:
    2007 Prius
    Model:
    Touring
    50+ MPG in 40+F temps
     
    Data Daedalus and bisco like this.
  11. George W

    George W Active Member

    Joined:
    Mar 12, 2018
    882
    481
    1
    Location:
    San Antonio
    Vehicle:
    2008 Prius
    Model:
    Touring
    I get about 42 in city. 40 on highway
     
    Data Daedalus, ydpplqbd and bisco like this.
  12. mubex

    mubex Junior Member

    Joined:
    Jul 1, 2018
    5
    6
    0
    Location:
    Puerto Rixi
    Vehicle:
    2012 Prius
    Model:
    ----USA----
    IMG_0360.jpg


    iPhone ?
     
    Data Daedalus and George W like this.
  13. ydpplqbd

    ydpplqbd Active Member

    Joined:
    Aug 1, 2019
    362
    166
    0
    Location:
    NJ
    Vehicle:
    2006 Prius
    Model:
    Three
    Now that it is in the 50F+, I am getting in the 48-50mpg range (so long as I don't do too much interstate driving - say less than 40% per tankful). Lowest mpg I have gotten so far with my Gen2 has been 42mpg on a long trip through very hilly, cold upstate New York (say 15F to 30F range) while driving at 70mph to 75mph (speed limit is 70mph in this area for 100 hundreds of miles and then into PA).
     
    #273 ydpplqbd, Mar 15, 2020
    Last edited: Mar 15, 2020
    Data Daedalus likes this.
  14. ydpplqbd

    ydpplqbd Active Member

    Joined:
    Aug 1, 2019
    362
    166
    0
    Location:
    NJ
    Vehicle:
    2006 Prius
    Model:
    Three
    Don't you live in the land of 80mph speed limits?
     
  15. George W

    George W Active Member

    Joined:
    Mar 12, 2018
    882
    481
    1
    Location:
    San Antonio
    Vehicle:
    2008 Prius
    Model:
    Touring
    Yes, outside of the county and only on the interstate. My commuting from the country only involves US Highway so standard speed limit applies
     
    Data Daedalus and ydpplqbd like this.
  16. Christov Tenn

    Christov Tenn Junior Member

    Joined:
    Jan 28, 2020
    50
    14
    0
    Location:
    Stepford, Tennessee
    Vehicle:
    2016 Prius
    Model:
    Three
    As the weather's warmed up here in Southern Middle Tennessee, I've been getting 47 mpg at about 125 miles into my latest tank of gas. About 207,500 on the odometer.
     
    Data Daedalus likes this.
  17. ProspectivePriusPeruser

    ProspectivePriusPeruser Junior Member

    Joined:
    Jun 3, 2019
    42
    8
    1
    Location:
    Australia
    Vehicle:
    2008 Prius
    Model:
    N/A
    Assuming I can trust the readout on the MFD, I'm getting 4.8L/100 KM - or - 49.003 MPG. I have a nearly 3 month old HV battery, 395000 KM on odometer.
     
    Data Daedalus likes this.
  18. Christov Tenn

    Christov Tenn Junior Member

    Joined:
    Jan 28, 2020
    50
    14
    0
    Location:
    Stepford, Tennessee
    Vehicle:
    2016 Prius
    Model:
    Three
    Yes. That's the assumption I've made, too. Sometimes I've found the vehicle's calculations do not match my own.
     
    Data Daedalus likes this.
  19. jerrymildred

    jerrymildred Senior Member

    Joined:
    Oct 28, 2016
    8,136
    9,900
    0
    Location:
    Tampa, FL
    Vehicle:
    2017 Prius Prime
    Model:
    Prime Premium
    My wife got gas a little too early because prices plummeted a few days later, but I guess she's making the most of it. 2007 with about 139k miles on it. She is not a hyper miler, but she is a very sensible driver. That probably would work out to about 51 mpg in reality.

    IMG_5494 copy.jpg
     
  20. Albert Barbuto

    Albert Barbuto Junior Member

    Joined:
    Oct 29, 2019
    39
    31
    0
    Location:
    Northeast USA
    Vehicle:
    2005 Prius
    Model:
    Base
    On the highway during the Summer, 58mpg at 60mph. The included pic shows a 23 mile trip from one town to another, 7 miles at 50mph, the rest 40mph, with perhaps two miles 35mph.
     

    Attached Files:

Loading...