which models they sell that have the lowest rolling resistance since some articles claim it can make as much as 8% difference on your gas mileage..
I just got a reply from Yokohama, Here it is:
Dear Valued Customer,

Thank you for contacting our offices.



This information is for propriety purposes only. We do not have this information available for your review.



Sincerely,

Consumer Affairs Department

I guess that they don't want to sell me any tires eh?