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To get better mileage you have to lower rpm at cruise. That really is the bottom line. I run a 255x45x18 when stock was 245x45x18. It's a little over 3% in diameter larger.
The probe responded to the pipes because of the turbo. they are under-engineered for durability reasons. That 1.8 is not going to like larger pipes
I would focus on air flow after tire size. cleaning up the front and doing under belly pan work is not sexy, but it is the # UNO result getter on this forum.
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