I have since installed Injen CAI and MEGAN Mid and Axle pipe combo.  An exactly 200 mile round trip with average extra weight of 400lbs total addon weight,  which included 4 on ramps, 2 aggressive passes (25-85, and 45-85(mph))  through three 25 mph towns  with multiple stops and tesiously winding back roads at 45-55 mph with only 65 miles of actual highway I achieved 34 mpg wiht 2k shifts and cruise control.  I thought my car was hating the hyper miling, due to the lack of response in town at the end of the trip but found it was the a/c from the defroster, shut off and everything was okay.