The crown vic's filter has two curves in it, like a serpinitne, the SUV type is a straight filter, like an cheap aquarium filter - it allows the fuel to pass through and catches the dirt, rust, suger... The serpintine filter doesn't allow excess fuel to push through to the fuel line. This restriction saves fuel by only allowing what is need in the combustion chamber. Alot of your gas gets waisted in the combustion chamber if you don't control; 1 - the flow of gas (keeping the jets clean on fuel injectors, 2 - wild spark from spark plugs that are dirty or gaped wrong. To test this, drive around and punch the gas every time you take off from a stop light (provided that there is no one in front of you). Your gas milage goes down fast! Even if you drive "normal" if your fuel system isn't clean you are doing the same thing. My engine is old so I use all the products that are rated for "older" engines even if I don't have near the miles a car of the same age has on it and it works great. I don't know of too many people who can say their Explorer (mine is a 97') gets 25 miles to the gallon. They got 15 at best when they were new.

I took it to the Ford dealership to get a tune up and they said the engine looked brand new. I have no ware and tear on the major moving parts. The front dif is trashed though so no 4 -wheelin for me for now...

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