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Mud flap really wont make a lot of difference.
Seach the 'tire pressure' threads, I can promis you 42 is no big deal.
Also, check a nissian site ( I am a moderator on FRESHALLOY . COM) and see if the ecm and tcm have a 'learning ability'
On the 02 Infiniti Q45 the ecm (engine brain) and tcm (transmission brain) will adjust over time to how you drive.
I drive pretty easy so the car's brain adjusts for better mpg instead of speed.
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