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I'd go 245/35-18. The 235/40 is taller, 25.4" vs 24.8", so it gives slightly worse gearing and higher ride height. No weight penalty for the 245s, and a smidge more lateral grip. No doubt some will insist that 245s are "too wide" for 8.5" wheels, but it's a totally legit fitment, and preferable over the 235/40s.
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