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    Engine issue- MPG dropped by 10mi this year

    Hi, I have a 2016 RC390 with the following mods made last year. Current ODO = 2,250mi Yoshimura CF RS-9 exhaust / K&N Air Filter / MMNTBX Air box mod. / PC V with map from Chad (Commonweatlh) who also flashed ECU with "Akra" MPG is down this year to about 55 I don't feel any real power...
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