Hard tires make one pay a penalty in long-term reliability. Which is what Economy really is. MPG is only an indicator of operator mindfulness.
No road vehicle is designed without tires taking some of the impact. Alter that and pay a MUCH higher price than any putative fuel savings from incorrect inflation.
It also goes straight to the operators physical condition. Why wear one’s self down prematurely? No one is as good at day’s end as at the beginning. NVH deteriorate one’s applied skill.
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