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Old 03-26-2011, 08:56 PM   #11 (permalink)
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Quote:
Originally Posted by zonker View Post
ahh, gotcha. then it's my conclusion the reason why michelin energy savers finished so well in that comparison is because they weren't pitted against other LRR tires.
Even if they were, they'd be at the top of the FE rating.
The Energy Saver does have some deficiencies in other areas - especially the wet handling and the feel in the wet.
It hasn't really failed me in the wet, but it feels like it's on the edge, so I back off.

When you put these on, you must realize they're not a sports or high performance tyre. Perfect fit for hypermiling IMHO.

So, lets take a look at the manufacturers' websites.
I used either their Belgian or common websites.

Quote:
Goodyear efficientgrip 0.1%
Is sold as a LRR tyre.

Quote:
bf goodrich g-grip 0,9%
Performs surprisingly wel, even though not claimed to be a LRR tyres.

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Nokian hakka green 0.9%
The naming gives it away.

Quote:
barum bravuris 2 1,5%
No LRR claims.

Quote:
continental contipremiuncontact 2 1,7%
Continental don't even hint at FE for this tyre.

Quote:
Vredestein sprottrac 3 2,1%
Vredestein claim LRR on their website.

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Pirelli cinturato p7 2,8%
Pirelli claims the tyre to be energy efficient.

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Bridgestone turanza er 300 ecopia 4,4%
Supposed to be a LRR tyre.

Quote:
Linglong green max 4,5%
Says to be green, but clearly isn't.

Quote:
Dunlop sp sport fastresponse 6,2%
Despite the "sports" name and intended usage, Dunlop claims LRR, but apparently doesn't deliver.

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Old 03-26-2011, 09:50 PM   #12 (permalink)
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Thanks for these listings, and for the discussion they have created. I have a simple question: what does the percentage mean? A ranking?
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Old 03-26-2011, 10:34 PM   #13 (permalink)
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Originally Posted by California98Civic View Post
Thanks for these listings, and for the discussion they have created. I have a simple question: what does the percentage mean? A ranking?
It appears to be a percent difference between the best rated tire (ie 0% difference all the way to 6.8% higher fuel consumption over the best in test sample.
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Old 03-27-2011, 12:46 AM   #14 (permalink)
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If Michelin Energy saver is a rating of zero, and the Hydro Edge Green X tire is supposed to have an even lower rolling resistance than that, we're into the negative numbers for this comparison lol.
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Old 03-27-2011, 03:42 AM   #15 (permalink)
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From what I've gathered, the old data for wheels our size (if you're using stock rims), says that the Bridgestone B381 tire has the lowest rolling resistance of any tire (other than the stock 1st gen Insight Potenza). Those tires are several years old, however, so it wouldn't surprise me if a more efficient tire has come along.

I have done some moderate research, and I have not found any claims for a better tire than the B381. Anyone else have some thoughts?

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Old 03-27-2011, 05:28 AM   #16 (permalink)
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I would dare to say that those B381 arent anymore best of their class. That is almost 10 years old information... Other new very LRR tires are the ones on that test and also:
- Continental Ecocontact 3, premium contact is not "eco" tire but overall good summer tire. This should have even lower LRR values.

If you choose a LRR tire from well known manufacturer you have better chances to get LRR tire than with other models. They just promise it but dont deliver. However its sad that there are so many tires on the market that you cannot evaluate all of them for LRR. I am sure there are some unknown manufacturers which design very LRR tire models. Problem with those are that they are not "safe" to drive because you cannot predict they behaviour very well on wet surfaces etc. So you lose the grip all at once.

I will try to read the magazines and post more LRR results from other magazines.
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Old 03-27-2011, 11:16 AM   #17 (permalink)
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Quote:
Originally Posted by JMac View Post
I have done some moderate research, and I have not found any claims for a better tire than the B381. Anyone else have some thoughts?
Bridgestone claims its new Ecopia EP422 to be a rolling resistance tire. Since it is new, it wouldn't be part of an older study. I'd love to see test results. This is one of those areas where this forum identifies a market interest that the manufacturers are apparently not satisfying very well at all. Somebody from the companies should read this forum. I have to think that each one of us possibly represent an untold larger number of "early adopters" who would likely latch-onto a well-marketed LRR "eco/mpg" tire... and each of them represents possibly scores more consumers who would buy ... given the right marketing information and resources.
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Old 03-27-2011, 02:56 PM   #18 (permalink)
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Originally Posted by California98Civic View Post
I have to think that each one of us possibly represent an untold larger number of "early adopters" who would likely latch-onto a well-marketed LRR "eco/mpg" tire... and each of them represents possibly scores more consumers who would buy ... given the right marketing information and resources.
I have to agree with you. Personally I would like to see some comparison tests which include Nokian's new Entyre tire. It is supposed to be LLR and still handle poor weather reasonably well also.
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Old 03-27-2011, 04:26 PM   #19 (permalink)
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yeah, i wish I knew whether to buy the Bridgestone D381's, the Nokian eNtyre, the Cooper GFE, or the Kumho KR22's.
I have a set of Nokian WRg2s on my Prius that are excellent. Wet, dry, snow. They are a favourite tire on Priuschat. They claim to be LRR and myself and many on that site agree with that claim. Nice thing about the Nokians is that they are made from non toxic purified oils unlike almost all other brands. Tire rubber is actually usually toxic.

The Entyre is getting good reviews over there too but I wish I could see the numbers.
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Old 03-27-2011, 08:45 PM   #20 (permalink)
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The tire manufacturer claims remind me of the old adage "If you can't dazzle them with brilliance, then baffle them with bull****".

I've heard, for example, that the treadwear rating each manufacturer advertises is that manufacturer's recommendation based on their own personal research, and not from an independent lab, so a treadwear rating of say 200 by one company might match the same wear rating of a 400 claim made by a different tire manufacturer.

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