A wider rear tire like the 295/35R20 adds grip but also rolling resistance, which costs a little range compared with a square, narrower setup. The heavier and wider the footprint, the more energy it takes to move the car. If maximizing range matters more than ultimate grip, the square 255/40R20 configuration is the smarter daily choice. For spirited driving, the staggered traction is usually worth the trade.
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