Possible undiscovered performance and MPG issues with Prius v (lowercase v)

Discussion in 'Prius v Fuel Economy' started by kirill626, Mar 31, 2015.

  1. RB Smith

    RB Smith New Member

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    I have a 2017 on order an ill do the same. 1k, 5K and 10K
     
  2. mikefocke

    mikefocke Prius v Three 2012, Avalon 2011

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    '12 v 33k miles. 42MPG average.

    What has surprised me is my MPG at highway speeds is better than EPA. Recent trip to the mountains of NC with 3k elevation change and coming back in partial fog and rain (which means the tires are pushing the road water away which lowers MPG) (2 passengers plus full trunk of luggage) and I got 43+ MPG on the 400 mile round trip mostly at 60-70MPH with occasional oops 75s. Now granted I'm not a speed demon and will run a few miles under the speed limit when no other cars would be inconvenienced. But at least one '12 v does get EPA plus MPG and this at speeds higher than EPA uses.

    I love stopping for a bathroom break and getting filled up with $8 of gas.

    2 more PSI than the manual specifies. ECO on 100% of the time. No special tricks but I do try to watch several cars ahead and use that in my acceleration/deceleration plans. No mods. Original 16" Michelin tires. Not a stop light laggard.
     
    #102 mikefocke, Aug 13, 2016
    Last edited: Aug 14, 2016
  3. Stevevee

    Stevevee Active Member

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    low to even mid 40's mpg all summer this year. Friend bought a brand new one after seeing mine, and he's at 43 average since May.
     
  4. benkhanobi

    benkhanobi Junior Member

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    Yes, a 3.70 axle ratio in the 2012 model- and 2017 shows it's now 4.11 axle ratio- I searched on Google, "2013 Prius v 4.11 axle" and it turned up positive hits-- did Toyota change from 3.70 in 2012 to 4.11 in 2013?-- is that good or bad for the MPGs?
     
  5. rjparker

    rjparker Senior Member

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    Assuming the CVT provides the same output ratio, a higher numeric axle ratio would improve acceleration while decreasing mpg. The problem is the axle ratio is not as important as the effective final drive ratio which is the combination of the CVT gearing and the axle ratio. Since the CVT can provide "overdrive" ratios of perhaps 0.59/1 (rather than 1/1), the overall effective ratio is considerably less than 4.11 and could be 2.43/1 (4.11 x 0.59). Bottom line is that changes in the CVT programming or actual parts in the CVT could have resulted in the same effective gear ratio in the 2012 or the 2013 or the 2017. The official EPA numbers are the same for all years.
     
  6. benkhanobi

    benkhanobi Junior Member

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    I retired from the Chrysler Transmission and I can verify that the company seldom changed internal gearing on their FWD transmissions - they used a pair of match gears to adjust final output gearing to some degree. For example, a transmission for the old 3.3L engine had 200 rpm higher engine speed than the 3.8L engine at 65mph. A person would need to do a speed run with a 2012 v and a 2013 v using a OBDII scanner to find out what is going on- I wonder if Toyota dropped in some engines built for the regular Prius (3.27 axle) into the Prius v in 2012 to keep up with the backlog of orders-
    I found just such a rpm test on a Prius v of unknown year on youtube-
     
  7. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

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    With the Prius transaxle, is rpm dependent not only on speed but also any and all variables: wind, slight grade variations, ambient temps or whatever?

    I'm not sure, and my brain is full.
     
  8. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

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    I guess back-to-back runs, same course, would iron out the variations.
     
  9. mikefocke

    mikefocke Prius v Three 2012, Avalon 2011

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    Of course the v with its added weight compared to the hatchback had an adjusted final drive ratio to provide acceptable acceleration. Bigger and less aero too. But 42 for a wagon isn't bad in the real world. The CRVs of the world are lucky to get 30-32.
     
  10. benkhanobi

    benkhanobi Junior Member

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    I used the Wayback machine to look at the Fuelly stats on the 2012 and 2013 Prius v-
    in the summer of 2013 the 2013 model was already getting a high average of almost one mpg better than the 2012 model, which still holds true today. I think that switch to the 4.11 axle did help the fuel economy. It's disturbing to see the 2016-2017 models with such poor averages. Don't they have the same new battery design as the regular Prius? The newer models mpg averages don't look at all like the 2012 and 2013 models did when they were a year old on the Wayback machine website.
    website example: Toyota Prius v MPG Reports | Fuelly
     
  11. Mendel Leisk

    Mendel Leisk Lapsed Cargo Cultist

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    Maybe they something behind the scenes to protect battery better, at expense of mpg??
     
  12. rjparker

    rjparker Senior Member

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    The new larger Honda CR-V was the first Honda designed from the ground up with aero in mind, complete with active grille shutters and a 1.5L engine that develops 190hp with 34mpg highway. It also has a CVT transmission, electric steering and all the latest safety systems. If that was not enough, overseas they are selling a hybrid version with a 2.0L that is rated at 50mpg. Right now it's in the Chinese market and is now being introduced in Germany. It will be interesting to see Toyota's response, I would assume in the RAV4 line.
     
    Aaron Vitolins likes this.
  13. benkhanobi

    benkhanobi Junior Member

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    Maybe, but since many new car buyers don't keep a vehicle past 100,000 miles, I don't see how a longer battery life is a better than high mpg.
     
  14. bisco

    bisco cookie crumbler

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    i don't think the newest v's have the gen 4 lift back tech yet.
     
  15. benkhanobi

    benkhanobi Junior Member

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    if so, and it makes sense, I hope the fuelly mpg numbers on the 2016-17 cars is an just an aberration.
     
  16. mikefocke

    mikefocke Prius v Three 2012, Avalon 2011

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    I drove a CRV 1.5T and a RAV4h back to back yesterday. Much preferred the Honda for multiple reasons. In the end, decided not to buy this season.