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First, be sure you've calculated your mpg's correctly.
Second, you did remember to increase the inflation pressure on your 18" because you now have Extra Load tires - Right?
Third, Summer tire are not noted for their RR properties, so depending on what you actually put on, they could be TERRIBLE for RR - and you will never get good RR out of a 35 series tire. That's just not what they are about.
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