Double Hmmm...
I'm s/c'd with a K&N reverse cone on the end of an insulated c/f tube & a Borla muffler, & average 16.5-18 hwy., with an all time best of slightly over 23 going over (upside & downside) Vail pass.
I still think the farther west you go, the better the gas.
Yes, my in town mileage sucks, but that's my fault for having an addiction to G-force.
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