I tend to think that tires with thinner sidewalls and less tread are going to be cheaper, and that's more of a motivation for the manufacturers to install them than to be "environmentally conscientious".
To me "eco" driving is more about being "eco"nomical than "eco"logical. If the tires have less tread, they aren't going to last as long and with what I have to pay to have tires installed and balanced, it seems that any money saved on fuel will be spent on tires.
I'd like to find a set of summer wheels to install some high mileage dry weather tires, but here in the high mountains, weather can change at any time of the year, and you really do need that tread in order to safely get around.
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