Are people really getting 40+ MPG in Gen 2?

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

  1. jerrymildred

    jerrymildred Senior Member

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    A person could hyperventilate there!! :LOL:
     
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  2. VFerdman

    VFerdman Active Member

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    2007 bought in July 2017 with 175K miles on it. Fuely numbers in my signature are average since the first time I filled up this car. That includes the winter we just survived, which lowered the average significantly. I just turned over 190K mile mark on the clock. Still getting mid-40' to upper 40's in the summer. I did do a battery reconditioning with the Prolong system in October, but the fuel economy did not seem to be effected by it.

    I believe the OP has an issue. It may be the battery art this point, but I would stop idling to begin with. Idling in these cars really draws down the battery even when not doing much. Then the engine needs to come on way more. It's not a good idea to idle for fuel economy, IMO.

    I would also look into spark coils and other things related to the engine. Something is off, for sure.
     
  3. PriusTFTW

    PriusTFTW New Member

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    2009 120k 44.1mpg original battery
     
  4. wingfeathers

    wingfeathers New Member

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    I recently bought an '07 with 250k miles. I am getting 39-41 MPG, but I understand this is because I only take short trips so far (the engine wastes more fuel on short trips because it has to warm up each time & less time is spent per trip on electric).
     
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  5. jerrymildred

    jerrymildred Senior Member

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    Also, the engine is less fuel efficient before it's warmed up. Just like any gas engine.
     
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  6. LDPosse

    LDPosse Junior Member

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    I’ve been working on my hypermiling and towing in my ‘07. I think I could probably hit the original EPA estimate of 60mpg if I didn’t have those pesky mountains to drive over on my way to work!

    262E5C82-10D9-4380-89B1-695E0FBB0BC6.jpeg E0C832E9-C899-4D93-B6C1-CA4250FEA739.jpeg
    2449854F-64EB-4ADA-BE47-C583BB736B85.jpeg
     
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  7. jerrymildred

    jerrymildred Senior Member

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    That's looking REALLY good for pulling that trailer over mountains.
     
  8. Coedy

    Coedy New Member

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    I've only had my Prius (2008 - 120,000Miles) for 4 days and so far have had an average of 55.7(UK) MPG (I think that's around 46MPG Us?) over 3 trips totaling 80Miles.
    That is in and around the very hilly landscape of Wales, half was 70mph Motorway and the other half 30mph town driving and traffic jams.

    I am trying my best to learn P&G and also getting to grips with 'coasting' at motorway speeds (only the battery arrows showing) but practice will make perfect.

    I haven't even checked the tyre pressures yet! So this could be improved upon! I am amazed by the Prius and blows my old VW TDI out of the water in terms of efficiency and easy driving!
     
  9. VFerdman

    VFerdman Active Member

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    I find that the difference between "just drive it" mode, where I simply turn off the MFD screen and drive my '07 (with 190K miles) and when I do all my P&G technique and other things trying really hard to get the best score on the MFD video-game is only at most 5mpg (US). This doesn't mean I don't try to drive "economically", but it's just a small difference and it's worth knowing what it is for you as an individula. Some people have way more patience and skill at this and their difference may be greater, but for me, it's sometimes worth it to "just drive it". I live in the countryside with gentle rolling hills here and there and big valleys with level grade, so my everyday driving is economical as it is, it seems. I do make highway trips to Boston (about 90 miles on the highway) and highway is really a gas mileage killer for me as I simply can not go slower than 75 and stay awake, so I use my cruise control, which is also mileage killer from what I hear, and it still does well. Winter weather for me is much worse in terms of mileage than driving style. My numbers have dipped to high 30's in some of the coldest days. But my average is still in mid-40's and that's since the first time I filled this car up last July.
     
  10. MickyMatter

    MickyMatter Member

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    Driving with some attention, high mileages (>50 mpg) are possible.
    But driving several hours with maximum speed (112 mph speedometer/ 106 mph GPS), the mileage drops below 30 mpg. IMG_20180611_220724.jpeg
     
  11. jerrymildred

    jerrymildred Senior Member

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    I just put this on another thread, but I think it fits here perfectly, too. It's a screenshot from when my wife filled up her '07 yesterday. She is not an aggressive driver at all, but she also doesn't try to hypermile. It shouldn't be hard to get 40+ in a Gen 2 if it's not broken in some way and you're not driving it like the typical SUV driver or have some special driving situation that makes it work harder.
    MP- mpg.jpg
     
  12. goku2

    goku2 New Member

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    It has been my experience that if a car has a built in MPG/fuel per trip indicator, the accuracy drops if there is a long term fuel trim that isn't 0. So if the LTFT is -5 or +5, fuel accuracy may be affected by that same percentage. LTFT can be affected by a variety of things such as a dirty/old Oxygen sensor or perhaps a vacuum leak, dirty MAF or any number of things.



    As for OP with the fuel economy problem, at the very least he should replace his PCV valve and check on how his oil consumption is doing on a rolling 5K mile basis. Depending on how bad the oil consumption is, these cars start to plug up the catalytic converter which hurts efficiency as well. If the OP's car is in a very hot area, his excessive A/C usage and or the very hot battery could be negatively impacting the fuel economy. On an older, weak battery, the car may be eager not to use the battery pack but instead prefer to use the engine instead.
     
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