So here is a bit of an update!
Pre-header install, with crank pulley and grill block:
136.8 @ 4.753 gal of gas = 28.78 MPG
Me driving moderately spirited with exhaust header and bedding in new brakes:
334.3 Miles @ 12.48 Gallons = 26.79 MPG
Eco-miles, without grill block, with crank pulley, with header installed:
153.8 miles @ 5.542 Gallons = 27.75 MPG
So not quite the 28.78 from pre-header install...but...I also just installed new brakes and the morning commute included 2"/hr rain fall!
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