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LRR Tires - Measured Improvement

Discussion in 'Gen 2 Prius Fuel Economy' started by enerjazz, Apr 26, 2012.

  1. enerjazz

    enerjazz Energy+Jazz=EnerJazz

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    It's only 2 data points, but I'll eventually have a nice array of data on the effectiveness of LRR tires. I purchased my 2007 Prius used and the previous owner had put on new (but regular) tires. The Primewell 830's were not great, but I kept them for 2 years. I just upgraded to the Bridgestone Ecopia EP422. After just 2 tanks (not even broken in yet) I'm seeing a 4 mpg improvement (7.5%).

    The chart below has 3 nodes - all driven by me with essentially the same route:
    2004 Prius with Goodyear Integrity LRR Tires (and Integrity replacement tires)
    2007 Prius – bought car used just after new Primewell 830 (non LRR) tires had been installed.
    2007 Prius LRR - I recently replaced the Primewell’s with Bridgestone Ecopia EP422.

    Yes, it is just two data points, but at the same average temperature the two red squares are running well above the red diamonds. More data to come.
    [​IMG]
     
    #1 enerjazz, Apr 26, 2012
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  2. uart

    uart Senior Member

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    Good results enerjazz. I recently got a set of the EP100's and immediately picked up another 1.5 to 2 MPG. And this was with already a fairly good set of LRR tires (Hankook k415's).

    It will be interesting to see what it looks like after you gather a bit more data. :)
     
    #2 uart, Apr 27, 2012
  3. jdenenberg

    jdenenberg EE Professor

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    The GY Integrity tires have low rolling resistance in warm weather, but not in cold weather. Real LRR tires (I have used Michelin MVX+ and Nokian WR/WRg2 see attachment) will show a marked improvement in MPG in cold weather (still lower in the winter) over the GY Integrity tires.

    JeffD
     

    Attached Files:

    #3 jdenenberg, Apr 27, 2012
  4. JimboPalmer

    JimboPalmer Tsar of all the Rushers

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    Can we nominate this thread for the "Bob Wilson 2012 Graph Everything" award?
     
    #4 JimboPalmer, Apr 27, 2012
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  5. enerjazz

    enerjazz Energy+Jazz=EnerJazz

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    I can do Pivot Tables too. :)
     
    #5 enerjazz, Apr 27, 2012
  6. enerjazz

    enerjazz Energy+Jazz=EnerJazz

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    After 4 tanks, the LRR tires are still showing their value.
    [​IMG]
     
    #6 enerjazz, Jun 3, 2012
  7. F8L

    F8L Protecting Habitat & AG Lands

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    Thank you for proving the data. We have seen dozens of posts using anecdotal experience to express the point you are trying to make but it is nice to have pretty graphs to show the data at work. :)

    What I fins interesting is the degree of difference between tires labeled at LRR. We know that a LRR should be better than a non-LRR but there can be quite a difference even between tires labeled as such. The Continental ProContact with EcoPlus and the Energy Saver A/S is a prime example. Those two tires present a 3-4mpg difference yet both are labeled LRR. :)
     
    #7 F8L, Jun 3, 2012
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