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drees
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Re: The New Tire Replacement Post

Mon Nov 30, 2015 12:23 am

LeftieBiker wrote:Are you sure that your efficiency has dropped by 20%? That's an awful lot. I could live with maybe 10% less range, at most, and 5% less would be better.

As far as I'm aware, no one has documented a tire here that compares to the EP422 in terms of efficiency (within 5%), which is a shame.
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LeftieBiker
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Re: The New Tire Replacement Post

Mon Nov 30, 2015 2:43 am

drees wrote:
LeftieBiker wrote:Are you sure that your efficiency has dropped by 20%? That's an awful lot. I could live with maybe 10% less range, at most, and 5% less would be better.

As far as I'm aware, no one has documented a tire here that compares to the EP422 in terms of efficiency (within 5%), which is a shame.


The Pirelli Carving Edge studdable snows I use produce a drop of 0.1 m/kwh, which is comparable to a... 2.5% reduction? That's a drop from 4.4 to 4.3 in the same temperature and driving conditions. The Goodyear Eagle LS tires I use in warm weather are about the same, maybe a little worse.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

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GetOffYourGas
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Re: The New Tire Replacement Post

Mon Nov 30, 2015 7:31 am

LeftieBiker wrote:The Pirelli Carving Edge studdable snows I use produce a drop of 0.1 m/kwh, which is comparable to a... 2.5% reduction? That's a drop from 4.4 to 4.3 in the same temperature and driving conditions. The Goodyear Eagle LS tires I use in warm weather are about the same, maybe a little worse.


Well, your car overall is 2.5% less efficient, but what percentage of your losses are from the tires? If tires account for 25% of the energy loss in a car, then the tires are 10% less efficient.
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jjgilham
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Re: The New Tire Replacement Post

Mon Nov 30, 2015 12:52 pm

I just replaced the factory Bridgestone Ecopias with the Bridgestone Ecopia Plus (EP422+) tires 205/55R16 91H BW GRAND Touring.

I paid just over $500 installed with free lifetime rotation etc from Costco. I had about 32K miles on the factory tires and the fronts were bald on the outside edges. For the previous 5 days commuting (285 miles) on the original Ecopias I got 4.66 miles / kWh. In the following week for 5 days of commuting (284 miles) I got 4.40 miles /kWh on the new ones. This works out to about a 5% differential between very worn LRR tires and brand new LRR tires from the same manufacturer. I suspect that as the new tires break-in I'll get some of that differential back.

I've been very happy with the new tires, they feel much more solid in the rain and have a nice feel to them. I believe the + tires have a higher sidewall load rating (91) and I'm hoping they last longer they do sell with a 60k or 70k mileage rating, so at least if they wear prematurely and I've still got the car I'll get a partial refund.
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64chevy
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Re: The New Tire Replacement Post

Mon Nov 30, 2015 8:11 pm

I ordered new Continental PureContact tires today.
They'll arrive within a week or two. My understanding from prior research is that these are LRR and should provide comparable economy to the Ecopias (worn tires notwithstanding), but only time will tell. I also suspect I'm about to drop my first bar (TBH, I'm surprised it hasn't happened yet), and we are entering the cold season here in WI so range will suffer quite a bit due to more usage of heating, etc...

18K on a 2013 SV.

LeftieBiker
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Re: The New Tire Replacement Post

Mon Nov 30, 2015 9:55 pm

I was expecting to lose a bar any time now, but Leaf Spy says no. Maybe with Winter here, yours will keep that bar until at least Spring...
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Levenkay
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Re: The New Tire Replacement Post

Mon Nov 30, 2015 10:11 pm

jjgilham wrote:For the previous 5 days commuting (285 miles) on the original Ecopias I got 4.66 miles / kWh. In the following week for 5 days of commuting (284 miles) I got 4.40 miles /kWh on the new ones. This works out to about a 5% differential between very worn LRR tires and brand new LRR tires from the same manufacturer.
Some of this difference may come from the sheer difference in diameter between the new and old tires. I don't know how much wear is normal, but I think the OD of the LEAF's tires is about 24", so if there's 1/8" of tread wear, the diameter of the old tires will be about 1% less than the new. I very much doubt that the energy efficiency readout uses the GPS-sensed distance, so distance will be computed proportional to motor rotation. And since your "new miles" are longer than the old ones, it's going to take more energy to traverse them.

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drees
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Re: The New Tire Replacement Post

Mon Nov 30, 2015 10:30 pm

jjgilham wrote:For the previous 5 days commuting (285 miles) on the original Ecopias I got 4.66 miles / kWh. In the following week for 5 days of commuting (284 miles) I got 4.40 miles /kWh on the new ones. This works out to about a 5% differential between very worn LRR tires and brand new LRR tires from the same manufacturer. I suspect that as the new tires break-in I'll get some of that differential back.

Very nice! Looks like the EP422 Plus should match the EP422. Hopefully they wear better, too.

I have the EP422 Plus tires on my Prius. Efficiency has not been as good as the GoodYear Fuel Max that were on it, but other changes happened at the same time (wheel bearing replacement and alignment) which may be causing some of the discrepancy.
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Re: The New Tire Replacement Post

Thu Dec 03, 2015 11:34 am

jjgilham wrote:... I had about 32K miles on the factory tires and the fronts were bald on the outside edges...
It is worth pointing out that it is "normal" for the EP422 OEM tires to be bald on the outside edges because the tread on that portion of the tire isn't full depth. Also, unless one runs the tires at substantially higher than the Nissan recommended 36 psi, the outside edges of the tires will wear more quickly than they should. I try to run mine at 40-42 psi and some here run them quite a bit higher than that. Makes for a harder ride but better mileage and tire wear (and handling IME, I drive a LOT of mountain curves).

I mention all this because we get so many newcomers to this site that it bears repeating periodically, even though it is old hat to many here.

My experience with new EP422+ tires was much the same as yours. I also appreciate the improved snow traction of the new tires versus the old worn ones.
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bowthom
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Re: The New Tire Replacement Post

Thu Dec 03, 2015 12:15 pm

drees wrote:
LeftieBiker wrote:Are you sure that your efficiency has dropped by 20%? That's an awful lot. I could live with maybe 10% less range, at most, and 5% less would be better.

As far as I'm aware, no one has documented a tire here that compares to the EP422 in terms of efficiency (within 5%), which is a shame.



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.

Of course it's anecdotal but I can barely make 4 m/kWh driving around town (no freeway) and I regularly obtained 5 m/kWh before. That's with no heat / def. Now that winter is full on I'm really noticing the decrease in range and this is experienced with my always present work commute.

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