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Are you running grill blocking? Because that seems like it would be relevant to these pressure readings and would be really interesting if you still had such pressure differences when grill blocks and an undertray are installed, no?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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