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The VW XL1 has 115/80 R15 front, 145/55 R16 rear - narrow and tall tires. The Bridgestones in question are similar OD to standard 16" diameter tires.
Deflection is essentially like rolling uphill all the time, and even the small surface bumps in the paving add a little to that. A larger diameter wheel "bridges" across more of those bumps, and all else being equal, a larger diameter tire will have lower rolling resistance than a smaller diameter tire.
Consider bicycles.
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