cwerdna
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Re: The New Tire Replacement Post

Fri Dec 18, 2015 1:35 am

bowthom wrote:Yes I'm sure, I was hoping for it to improve once the tires had "broken in" if such a thing exists. They say that new tires have more rolling resistance than worn tires even of the same type & manufacturer.

See http://www.tirerack.com/tires/tiretech/ ... techid=177. There's more than just the change in rolling resistance.

'13 blue Leaf SV w/premium package (owned)
'13 blue Leaf SV w/QC + LED & premium packages (lease over, car returned)
'06 Prius

64chevy
Posts: 9
Joined: Sun Jul 26, 2015 1:44 pm
Delivery Date: 26 Jul 2015
Location: Madison, WI

Re: The New Tire Replacement Post

Fri Dec 18, 2015 7:42 am

So far, the Continental PureContact tires have been pretty great. They are marginally less quiet on some surfaces (but not all) than the pretty worn (5/32") OEMs. The grip is spectacular in the dry and in the rain, so far. No tests in the snow, yet. Also, I'm pretty much the opposite of an aggressive driver, so take that with a grain of salt. It's very hard to say if the range has dropped due to the cold weather (20F this AM) which also results in quite a bit more use of the environmental controls, seat and steering wheel heaters, etc. I should know if the efficiency is worse than the OEMs in about 6 months, maybe a year.

LeftieBiker
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Re: The New Tire Replacement Post

Fri Dec 18, 2015 8:35 am

64chevy wrote:So far, the Continental PureContact tires have been pretty great. They are marginally less quiet on some surfaces (but not all) than the pretty worn (5/32") OEMs. The grip is spectacular in the dry and in the rain, so far. No tests in the snow, yet. Also, I'm pretty much the opposite of an aggressive driver, so take that with a grain of salt. It's very hard to say if the range has dropped due to the cold weather (20F this AM) which also results in quite a bit more use of the environmental controls, seat and steering wheel heaters, etc. I should know if the efficiency is worse than the OEMs in about 6 months, maybe a year.


The easiest and possibly best overall way to compare efficiencies is to wait for a mild or warm day that you have "mapped" for efficiency with your Summer/old tires, then do the same with the Winter/new tires.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

board350
Posts: 11
Joined: Sun Aug 24, 2014 12:28 pm
Delivery Date: 19 Aug 2014
Leaf Number: 002117

Re: The New Tire Replacement Post

Mon Dec 21, 2015 9:56 am

I'm looking at getting new tires for the LEAF this week. It is still running 2 of the OEM Ecopia's that are nearly bald. The other 2 are GT Radial tires that came with the car when I got it (used).

I'm think of putting on a set of the Michelin Premier A/S however I'm hesitant over the loss of range that seems to be effected by these tires. Tire Rack list them when I select LRR tires but I have not seen any specs to confirm this. Consumer Reports mentions them as having "good" LRR attributes, but once again no specs. I have seen several forum post (1 here, Prius, Scion, etc.) that show the opposite actually, the tires are not very efficient compared to OEM LRR tires.

So is there only one LEAF out there running these tires? Anyone else have experience?

I was hoping for a little more grip over the tires currently fitted. Is it simply folly to expect more traction and maintain LRR? Would running the Michelin's at 44 PSI like the Ecopia's help substantially?

The other reason for selecting these tires is they are in stock while the Ecopia's are special order at Discount Tire (as well as the Continental Pure Contacts). Thanks!
2011 LEAF SL, battery replaced under capacity loss warranty 9 DEC 2014 at 36,446 Miles :D

Roostre
Posts: 40
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Leaf Number: 016655
Location: Salt Lake City

Re: The New Tire Replacement Post

Mon Dec 21, 2015 10:08 am

My research on the Michelin Premiere A/S has been similar to yours, but it *seems* that those folks that bothered to continue posting results after the tires broke in saw only a very small efficiency hit. A few even reported results equal to the stock Ecopias.

I've run them on our previous cars (2) and found them to be a superior tire for handling and traction. I did not measure efficiency accurately enough to know the impact, but they did seem to coast better than the previous set. Nothing concrete, however.
Caretaker of 2 Leafs:
WifeLeaf: 2012 SL First bar gone on 11/1/2015 @ 28,400miles -still more than adequate for the job.
DaughterLeaf: 2013 SV 12,500 miles (SOH=90%)

Moof
Posts: 179
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Leaf Number: 004023
Location: Beaverton, OR

Re: The New Tire Replacement Post

Mon Dec 21, 2015 1:22 pm

Roostre wrote:My research on the Michelin Premiere A/S has been similar to yours, but it *seems* that those folks that bothered to continue posting results after the tires broke in saw only a very small efficiency hit. A few even reported results equal to the stock Ecopias.

I've run them on our previous cars (2) and found them to be a superior tire for handling and traction. I did not measure efficiency accurately enough to know the impact, but they did seem to coast better than the previous set. Nothing concrete, however.


I've had mine for a little over a year and I am quite happy with them. I had a big hit when I got them, but it was just as the cold/wet weather was hitting the area, so it was hard to tell whether it was more the tires or the weather. By this last summer I was back to hitting 4.5-5.0 mi/kWh on my daily commute (I actually never got higher than 4.8 with the Ecopias). I didn't take detail measurements before or after, but on the whole I cannot tell a difference for warm weather, and never went through a winter with the Ecopias so I have no data there. My 40F dry weather efficiency is down around 3.8 mi/kWh without any heating, dropping to 3-3.4 with wet roads and defroster usage.

On slightly wet roads the Ecopias skittered and under steered around corners, which I hated, while the Premier's stick with confidence. My guess is that on the whole their extra wet weather stickiness makes for a little worse rolling resistance, but it is only a guess.
Last edited by Moof on Mon Dec 21, 2015 4:44 pm, edited 2 times in total.
2011 Cayenne Red bought used with 30k miles, manufacture data of 5/2011
42k miles 82% SOH 11 bars 218 GIDs at full charge
Running with Michelin Premier A/S with 42 psi for 10k miles

board350
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Leaf Number: 002117

Re: The New Tire Replacement Post

Mon Dec 21, 2015 2:02 pm

Well that's good to know that some LEAF drivers have driven them with good efficiency results. I just can't see how a tire could possibly drop range efficiency by 20%. If it is around 10% or better, even after they wear in, I would be just fine with them. I prefer sticky tires if possible. EV makes the RR a little more critical.
2011 LEAF SL, battery replaced under capacity loss warranty 9 DEC 2014 at 36,446 Miles :D

bayleaf
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Delivery Date: 24 Apr 2013

Re: The New Tire Replacement Post

Mon Apr 18, 2016 3:16 pm

Replaced factory ecopias with Kumho Sense KR-26 couple of months back. No impact on range. Inflated to 41 psi. Bought them used with 70% tread left from http://www.bestusedtires.com. $154 shipped for 4 tires.

bowthom
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Re: The New Tire Replacement Post

Mon Apr 18, 2016 5:05 pm

bowthom wrote:Hello Leafers,
It's been 5k miles since the new tires and here is my report:
YES, I am seeing a 20% reduction in efficiency vs the old worn Ecopias.
BUT, I am loving these tires, they handle great and really hang on to the road in the wet.

Don

bowthom wrote:Hello Folks,
Well, I popped for new Michelin Premier A/S tires for my 2011 Leaf at 43k miles. Have not done any efficiency tests but I do like the way they hang on to the road.

Will post / update here as I gather more data.

Don

Hello Leafers,
Here is my next update:
The Michelin tires now have 10k miles on them and I am happy to report that the rolling resistance has fallen off. I am now getting efficiency rivaling the Ecopia tires. One caviat however, when the tire temp is above 70*F efficiency is good. When they are cold it drops off. And yes, I know cold air and all that but the tires do not equal the Ecopias when cold. Must have something to do with the rubber compound used. They still handle and stop way better than the Ecopias especially in the rain.
So the good news is I am again enjoying 5.0 ~ 5.8 m/kWh on my daily commute. YAY :-)
Reserv Apr 20 - Ord Aug 31
Red - ETEC trim
BLINK inst 3/14/11 (rev 2.1.2B)
P1213 4/29/11 - Charger repl 6/8/11
P1273 2/15/12 - P32270 10/2/13
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jjgilham
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Re: The New Tire Replacement Post

Wed May 04, 2016 10:50 am

I have a 2013 SV. I drive it about 1300 miles a month and have a very consistent usage pattern. I live in Seattle and use the car for commuting and errands.

I replaced the badly worn stock Ecopias at the end of October in 2015 (32k miles) with EP422 Plus Ecopias from Costco ($461). I have a meter on my L2 charger and I record the meter and the odometer on the first of each month. I then add any kWh I charge from external chargers, as a result I've got a pretty good monthly data set with efficiency (miles / kWh) calculated from the wall.

As I browsed this thread, it occurred to me that I've got good data to assess the effect of the tire change. I've previously noted a pretty strong seasonal effect here in Seattle. In peak summer months I typically get 4.6 miles/ kWh but in the winter it drops all the way to 3.4 miles/ kWh (measured from the wall). The best way to normalize for the seasonal variation is to compare a given month with the same month from the previous year. This is much like how companies present their financial data (Q1 2015 / Q1 2014 ) for example.

Here is the data:

Date Month / (Month from previous year)
2/1/2015 107.2%
3/1/2015 116.3%
4/1/2015 105.9%
5/1/2015 104.8%
6/6/2015 101.4%
7/1/2015 105.2%
8/1/2015 104.7%
9/1/2015 104.9%
10/1/2015 104.8%
11/2/2015 99.0% TIRE CHANGE!!
12/1/2015 99.9%
1/2/2016 99.9%
2/1/2016 98.6%
3/1/2016 98.9%
4/1/2016 97.2%
5/1/2016 106.0%


1) Before the tire change there was a regular tendency for gradual efficiency improvement of about 5% a year (at least in the last year of the tires life). It is possible that this is attributable to a the reduced rolling resistance with tire wear. It is also possible I've acquired more efficient driving habits with time or that there are other causes but I think it is the most likely because of its persistence.

2) My data suggests one might expect a 5% - 6% efficiency hit replacing badly worn tires Ecopias with new Ecopias.

3) The tire change immediately rolled back efficiency to a percent or two below the level of 12 months prior, Over the following months the new tires continued this trend. This is with the exception of the the May 2016 entry (comparing April 2016 / April 2015) appears to be a step change it will be interesting to see if this persists. April was unseasonably warm in Seattle this year (6 degrees warmer in 2016 versus 2015 ) and that may have contributed to an April 2015 boost.

All in all I'm pretty delighted with these tires. There was an immediately noticeable better grip in the wet and they seem to perform to my satisfaction.
2013 SV 3-year lease @ 15k per year
2016 SV 3-year lease @ 15k per year

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