new gas

Discussion in 'Gen 4 Prius Fuel Economy' started by GaryD1, Dec 18, 2018.

  1. GaryD1

    GaryD1 Active Member

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    23212535-mmmain.jpeg
     
  2. GaryD1

    GaryD1 Active Member

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    Has anyone tried the 88 in gen 4 Prius? I have two cars, tried it in both. Both seem to be getting better mpg. I can paste the web link from Sheetz if I'm allowed to? I paid $1.95 gal here in NC. I will post a pic of readout tomorrow, think I got 125 miles on tank so far, half the driving interstate and half rural roads. I tried this gas in 2016 Prius eco and 2018 Camry LE.
     
    #2 GaryD1, Dec 18, 2018
    Last edited: Dec 19, 2018
  3. fuzzy1

    fuzzy1 Senior Member

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    It shouldn't, it actually should get lower MPG.

    But since the difference from E10 is only about 1.6%, you'd need quite strictly controlled conditions to accurately detect and measure it. Other common variables typically create larger differences and tank-to-tank variations than that, making it very difficult the accurately characterize the true MPG difference.
     
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  4. alanclarkeau

    alanclarkeau Senior Member

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    That's what I've experienced with previous cars - my 2006 KIA RIO and FORD FOCUS (and others) of the same era did consistently worse on E10.

    But I've filled Samantha a few times in a row with E10 and she's happy with it and has at least equalled and in some cases, improved on ULP. I guess the EV component of driving isn't concerned about what fuel is used
    o_O.

    The Renewable Fuels Association, in a report 2 yrs ago said
    "
    All hybrid vehicles (when operating on engine power for PEVs) and ‘strong’ HEVs especially operate more frequently at the engine’s peak efficiency region, and for this reason would be able to capitalize on high octane mid-level ethanol blends’ capability for further improving the efficiency and fuel economy and reducing GHG emissions. Hybrids that utilize Atkinson cycle engines are also subject to the potential gains from high-octane ethanol blends" - so maybe there is something in it?
     
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  5. bbald123

    bbald123 Thermodynamics Law Enforcement

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    I saw a very noticeable drop in MPG which is what I expected due to the additional ethanol.
     
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  6. dubit

    dubit Active Member

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    We've had E15 here for quite awhile now. When I first switched I noticed a significant up & down swing on my first few tanks. (Click on my fuelly) But it has since stabilized. We're in the cold weather months now so my overall MPG's are way down, but I didn't really notice much of a change. Not sure of why I seen the huge swings when I initially switched, but other than that... I'm good with it and I run it in every fill-up.

    [edit} the big "swings" were back in late Aug early Sep. So if you click my fuelly you'll have to then click "show all fuel-ups"
     
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  7. dubit

    dubit Active Member

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    He may be seeing the same big increase in MPG's, I initially seen - then it swung down, then back up yet again before stabilizing.
     
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  8. wjtracy

    wjtracy Senior Member

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    Lot's of the anayltical qualities of gasoline are invisible to the user. So we don't know energy content and other formulation variables. So it is conceivable there are variations, at the pump, day to day etc, so maybe one day E15 has more MPG but in general we would expect it has lower MPG.
     
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  9. Mendel Leisk

    Mendel Leisk 'Orrible Oracle

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    Checking the Owner's Manuals, 2010:
    upload_2018-12-19_8-2-45.png

    And 2016:

    upload_2018-12-19_8-4-33.png
     
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  10. wjtracy

    wjtracy Senior Member

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  11. dubit

    dubit Active Member

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    His explanation of direct injection was helpful. My son and brother (both master techs) complain about working on these vehicles all the time. Major work required around 40-50k because they get all gunked up.
     
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