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I use a K&N, Mobil1 10W-30, and Bosch Platinums. I get 21-25 MPG if I drive nice. The K&N was for economics only. Paper filters are 10 bucks a piece. The Mobil1 is for peace of mind. Bosch Plats run better at 2 years of age than NGK's run new. I have found this with my Cavalier, Bonneville, Saturn, and my Nissan PU.
The bottom line is that the fuel economy has dropped. That means something has changed. I would look into an air filter and plugs. I would also inspect the brakes. Has anything been changed or adjusted on the truck recently? Tires, brakes, Bug Guard, Bra, Lift Kit, timing? These all can change fuel economy. Good Luck
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Aaron Ford
95 2WD Nissan PU E
2002 Oldsmobile Intrigue GX
"The hard part about playing chicken is knowing when to flinch" Scott Glenn in The Hunt for Red October
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