Could be that Nissan is trying to squeeze every MPG out of these cars. When I had mine dynoed a few years ago (CBE, HFC and Cold Air Intake) mine was in the 12.25 - 13 range, even at wide open throttle with the stock tune.
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mults
40th Anniversary 'Z', 312.06HP/260.58TQ (Dynosty EcuTek Tune)
Build Date/Number: 1/27/2010 #706
Berk HFC + CBE, R2C CAI, Clear Bra, Cleveland Z Club
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