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A lot of things change with the different tires, not only the weight but also rolling resistance, CdA (235 vs 195), circumference : the 235 is 2% bigger which means worse accelerations but also small benefit for mpg (outweighed by CdA and weight).
The worse performance is not only due to the weight.
To make the test consistent, they should have use always the same set of tires and put heavy balancers on the rims.
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