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Welcome to EM!
Yes, the oversized tires are bad aerodynamics, and they can't have good rolling resistance, and they are heavy! Tire weight essentially "counts twice" -- it is part of the total vehicle weight that has to be moved; and it has to be spun. The stock tire size with smoother (all-season) tread and say 44psi in them would be better on all three counts.
What is the stock tire size?
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