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

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Trying to increase gas mileage-
local 9-10mpg
short hwy. - 13
long (100 miles) hwy.-25!
(1) Answer
(1) Comments
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Use OEM for the best results. Motorcraft fortunately is available at the aftermarket stores like carquest etc...
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