Thread: XFi vs. LSi?
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Old 05-30-2008, 08:03 PM   #3 (permalink)
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xfi had a FE cam , 2 ring piston , and CPU for better mileage . it got about 50 mpg from the factory. i've done the same with a lsi car . it has an advanced cam gear , mileage cam , power pulley ,2 inch open exhaust , 13/175r13 tires (50psi) and high speed transmission. i get 50 mpg average with this combo, even with the heaver car body.

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