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4 tires making rolling resistance for a total of 100%... remove 1/4 of the tires, you remove 1/4 of the rolling resistance (in stupid math).
If you really want to get technical, you're not really losing 25%, because you're now placing more weight on one tire. You might in actuality lose only 20%, but it's still significant.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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