NGK iridium IX spark plugs OK or is there a better brand? on 2004 Mercury Grand Marquis

Trying to increase gas mileage- local 9-10mpg short hwy. - 13 long (100 miles) hwy.-25!

by in Valley Stream, NY on August 29, 2013
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1 answer 1 comment
ANSWER by , August 29, 2013
Use OEM for the best results. Motorcraft fortunately is available at the aftermarket stores like carquest etc...
COMMENT by , August 30, 2013
Thank you,will do.