Prius Eco 58 MPG vs Prius 54 MPG - What's the difference?

Discussion in 'Gen 4 Prius Fuel Economy' started by cyclopathic, Nov 18, 2015.

  1. bentbow

    bentbow Junior Member

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    that sounds very believable. i don't know anything about epa testing but weight classes make sense. they don't have any real-world driving component?
     
  2. goinskiing

    goinskiing Active Member

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    Love my '18 Two Eco fuel economy, so far averaging 63 MPG at the pump since I've had it.
     
  3. Classic Car Guy

    Classic Car Guy Active Member

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    Congrats. That's incredible! I don't know the exact mpg on my 2007 but one time I forgot to pump the gas and I got 395 miles and it just turned 1 bar on a 50/50 city/highway driving 30 miles one way. Probably not the best but I'm very happy with it.
     
  4. John Kuhn

    John Kuhn Member

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    Is that mileage for your '18 Two Eco? Because your signature says you have an '18 Prius Prime?
     
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  5. Gokhan

    Gokhan Senior Member

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    Only a 30 lb weight difference between L Eco and LE, L Eco missing the rear wiper with arguably some benefit in drag coefficient, same lithium-ion traction battery, and same tires. These would hardly make a significant mpg difference between the two in the real world. I don't really trust the manufacturers' mpg tests, and I think Toyota simply biased the tests for L Eco, rounding up the numbers etc. The actual real-world difference is probably only about 1 mpg.
     
  6. rjparker

    rjparker Tu Humilde Sirviente

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    Back in 2015 when the op started this thread, the batteries were lithium-ion in the eco versus nickel-metal-hydride in the base model. That allowed more efficient use of energy. Today standard Prii with the aftermarket lithium battery are also seeing higher mpg.
     
    #246 rjparker, Jan 2, 2022
    Last edited: Jan 2, 2022
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  7. Mendel Leisk

    Mendel Leisk Patron saint of newly poured sidewalks

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    From the 4th gen get-go, other levels beside Eco had lith-ion. IIRK currently base and AWD levels have the older chemistry; all others are lith-ion.
     
  8. Tideland Prius

    Tideland Prius Moderator of the North
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    All other levels except Two you mean. Two Eco had the Li-Ion. Only the base Two had NiMH in for the 2016 MY (2017 too I think).
     
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  9. Gokhan

    Gokhan Senior Member

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    So, your theory is that in circa 2016 Toyota tested the base model (Prius Two), which was the only model with a NiMH battery, and Prius Two Eco, which had a lithium-ion battery, and none of the other models, which all had lithium-ion batteries. I guess that is a plausible explanation.
     
  10. Rmay635703

    Rmay635703 Senior Member

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    As the Ford fuel economy lawsuits have proved at a minimum Toyota could simply test one car in the platform and interpolate the other models with no additional testing
     
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  11. Gokhan

    Gokhan Senior Member

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    Not even interpolate/extrapolate—equate. Note that the Touring models had 2.0-cm-wider tires, which would result in less mpg, but they all received the same mpg rating.
     
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  12. Mambo Dave

    Mambo Dave Active Member

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    My L Eco gets almost 40 MPG. Best fuel mileage car I've ever had! :D
     
  13. Gokhan

    Gokhan Senior Member

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    Coming back to this again, I don't think the battery difference is the reason. I think it is a testing/reporting artifact. I had also noticed that Prius Eco had produced a lot higher NOₓ emission during testing, which could indicate operator differences. Or perhaps something is programmed differently in Prius Eco.

    Do higher NOₓ numbers explain Eco's much superior fuel efficiency? | PriusChat
     
  14. Rmay635703

    Rmay635703 Senior Member

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    I think it’s both.
    A touch of lean burn plus the fact the car is on the edge of the next weight class.

    The days of a lot of people reporting fuel economy to various sites like ecomodder are long gone so comparing a large group of ecos to other PRII in the real world has become impossible.

    meaning we don’t really know how much better the eco really is and considering it’s dad are numbered it will become moot with the next gen
     
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