New Bridgestone Ecopia Tire Promises To Increase Range By “20 Miles Per Tank”

APR 18 2015 BY MIKE ANTHONY 15

This new Bridgestone Ecopia EP422 tire promises a *range increase of ~ 20 miles for a typical ICE gas with 400 miles of gas-tank range.

Roundy things that go on cars!

Roundy things that go on cars!

Therefore, this tire should enable electric cars to increase range as well, though we’re not exactly sure by how much (maybe 2-3 miles on an electric vehicle such as the Nissan LEAF), and the increase would also vary based on whether or not your EV already comes equipped with low-rolling resistance tires.

Per Green Car Congress in regards to this new tire:

“The technology behind the tire improves rolling resistance by controlling the interaction between polymer, filler materials and other rubber chemicals at the molecular level. A fuel saver sidewall compound also helps lower rolling resistance by both returning more energy back to the tire and reducing heat generation as compared to a traditional sidewall.”

“Ecopia tires are made using recycled ground rubber, which contributes to at least 5% of the tread compound in every Ecopia tire. Ecopia tires help channel water away from the tire through circumferential grooves, which improve resistance to hydroplaning and increase wet traction.”

These tires come with a 70,000 mile limited warranty and there are 43 different sizes to choose from.

Does anyone have experience with these tires? We would love to hear some feedback on them.

More Ecopia Tire information here and Bridgestone savings calculator here.

*Range projection is based on rolling resistance in lab testing comparing Ecopia EP422 Plus (215/60R16) to Firestone FR710 (non low-rolling resistance tire – 215/60R16) when new

Source: Green Car Congress

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15 Comments on "New Bridgestone Ecopia Tire Promises To Increase Range By “20 Miles Per Tank”"

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What I can say from my experiance with low resistance tires at an EV is that the energy saving is even higher. Imho that’s because low rolling resistance improves the gliding distance and regen efficiency as well.

LRR tires have a greater affect on EVs because rolling resistance makes up a larger percentage of fuel usage on an EV than an ICE. For an ICE a good percentage of fuel use comes from just the engine running. Which is why an ICE will have its best MPG at around 60-70mph, less engine run time for the same distance vs say 45mph. An EV makes this tradeoff way down at like 25mph.

Wind resistance becomes too much of an issue for Gas cars to get best MPG at 60-70 mph. Some do have a gear for that target speed but they still get better MPG below 40 mph.

“Which is why an ICE will have its best MPG at around 60-70mph,”

Nope. Slower is better, like Doug says, ~60 km/h is probably the sweet spot for most cars.

Sounds like they are choosing there own baseline data. To claim the largest improvement, you would use the worst baseline you can find. Not likely that the baseline tire is used on any car that is marketed for fuel efficiency or range. Hence, I’m not sure this tire is significantly better than other LRR tires already in use. It would definitely be good to have some independent lab test this compared to other LRR tires.

The Bridgestone Ecopia EP422 has been out for a long time – it’s the OEM Nissan LEAF tire for the 16″ size (205/55/16) since it’s introduction in late 2010.

What many are really interested to know is the difference between the EP422 and the EP422 Plus.

It does appear to have a higher treadwear rating – but does it also further improve rolling resistance and traction as well?

Longer tread wear might be because the EP422 Plus has 11/32 tread depth in many sizes, compared to older pre-Plus EP422’s that came with as little as 9/32 of tread in some sizes.

Good point there is considerable tread depth variation from size to size. However the size my 2011 lead has the same tread depth for all 4 variation between service load and Plus and non plus. I would not have thought that.

How does this compare to other LRR tires..?

My experience has been Michelin Energy Saver is the best LRR tire, confirmed by both CR and Tire Rack. In the past the only thing Bridgestone Ecopia had going for it was it’s cheaper. Curious to see a test comparing the new version.

Someday I hope the tire manufactures will publish actual test data in standard SI scientific values. What a novel breakthrough concept that would be! 😉

I don’t think the marketing department would ever let that happen.

On my second set of ecopia tires on 2012 Leaf with 30100 miles. I think they wear out too fast.

That sorta depends. How many miles ago did you change them? And how do you drive? 30K miles out of a set of tires is not a bad figure necessarily, especially if they are both efficient and sticky.

I honestly cannot wait to get rid of the Ecopias on my 2013 Leaf. They’re terrible tires. Very bad traction in wet conditions (I live in a rainforest; we’re currently on our 14th straight day of rain), they’re already wearing out (about 12,000 miles on the set), noisy and they transmit road vibration through to the car.

I *may* try out the Michelin Energy Savers but I’m more likely to just go with normal tires since, so far, the Ecopias seem to be no more efficient than my studless winter tires. In fact, I’d almost swear that I saw a range DROP going from my winter tires back to the Ecopias a few weeks ago.