Ford Crown Vic, Mercury Marauder, Grand Marquis
So recently I've been getting really bad gas mileage in my '97 crown vic and
it didn't have that issue before I took out the spark plugs, And put brand
new ones(Motorcraft SP-432 AGSF32FM). I did make sure they're gapped
properly to .54mm. I also replaced the fuel filter, air filter, cleaned out...