I have been doing some research too. I am going to upgrade plugs to split fires and upgrad wires and then get a POP charger. A friend did this with his JEEP Cherokee and improved his fuel mileage by 2 mpg. I know, I know some of you may think split fires are crap but I have used them in all my vehicles and have noticed a improvement in power and mpg.

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'00 Solar Yellow XE
Automatic
3-pack