LOL, you're right. I of course used 7% difference instead of .7%. That's what I get for cranking through this on a quick lunch break.
Awesome pic Sinecure!
Check the tire specs on tirerack, they can vary between brands/models, even
if they are the same size. Tread depth, width, revs/mile, etc. will vary.
The OEM SP SPORT 5000 DSST CTT P245/40RF19 is rated at 782 revolutions/mile.
X-ICE XI3 225/50R18 (10.5/32" tread depth) is listed as 774 revolutions/mile.
Blizzak WS80 225/50R18 (12/32" tread depth) = 775 revs/mile.
X-ICE 225/50R18 vs OEM = 1.0% difference. Still not very significant.
Look at Nokian as well, they'll cost a bit more, but arguably one of
the best you can get:
Hakkapeliita R2 225/50R18 (12/32" tread depth) = 776 revs/mile.
I had Hakka2's on my '93 Sentra SE-R, got 7 winters out of them, and
still had 6-8mm tread left. They had amazing traction in snow and ice,
accel, braking and cornering.
Also had General Altimax Arctic on my '98 Sentra SE -
they were decent as well, but not as good as the Nokians.
Last winter I had new Conti DWS06 on my Q50 Hybrid AWD.
They were O.K. accelerating in the snow/ice, but mostly due to AWD -
braking not nearly as good.
I'm considering getting Hakka R2 this winter.