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Should I have my Lexus re-chipped?

My Lexus LS diesel has covered 83,000 miles and is trouble free, but my only concern is lack of power and poor economy (30-35 mpg). I'm considering having it re-chipped, would this be a good idea?

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Flaw of the car. The gearing is too high. I wouldn't have anything chipped at this sort of mileage. And any fuel economy benefit will be wipes out many times over by the insurance hike.
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