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ummmm.... How does new tires translate into more rolling resistance. New tires have stiffer side walls and the belts are stiffer. This leads to to lesser deformation which has the same effect as hyperinflation and means less rolling resistance. Every time I get new tires my mileage goes up. Further proof of this is when new tires are tested for rolling resistance they use brand new tires not used ones.
In discussions with my father who used to work in designing tires for Firestone he confirmed that stiffer side walls and belts would lead to lower rolling resistance. In fact its the stiffness of the belts is what gives radial tires better performance and lower rolling resistance than ordinary tires.
as for a drop in power and fuel economy any wind that is not a tail wind is going to require more power to travel the same speed. cars are designed to travel through the air forwards not sideways.
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