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The avid ascend serries of tires are only average rolling resistance.
Theirs avid envigor too, but it's not a fuel economy tire.
I did the reverse of what you did. I replaced ecopia with avid ascend.
I put 2 of those Yokohama tires on my leaf and saw nearly a 20% range drop.
But aside from fuel economy the avid ascend tires are a better tire in everyway.
The only way they might be tied is I have had the avid ascend on other cars and they last a long time. I would have to say they are tired or really cost in longevity, but my bet would be that the Yokohama lasts a little longer.
It was so bad I took the new avid ascend tires off the leaf after 4000 or 5000 miles and replaced them with michelin energy saver A/S. They are supposed to be more fuel efficient than the ecopia. It didn't seem like there was much of a break in.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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