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The oem airbox is usually more restrictive than an aftermarket intake. On my 07 fit i noticed a 20 mile per tank increase in fe .18 mpg however on my 89 crx dx, a -1.5mpg. Both with a warm air intake of about 30-40 degrees avove ambient air temp. Unless someone has done a proper aba test on that motor it falls to you to find out my good sir
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