I think perhaps there could be a r.r. improvement with skinny tires IF the vehicle is never heavily loaded and it would also help if the vehicle went through a weight loss regimen.
One of the questions is do these 125 and 135 tires have low r.r. and Mr. Fry insinuated that he's seen the values? The low amount of plies suggest they might. The thin sidewalls suggest they might. Some have nice tread patterns that suggest they might. Unknown is if they are made with nice low hysteresis compounds.
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