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Hi, new to forum. My 02 7.3 just died with 380.000 miles on it. I put a chip in it when it was new, 20+mpg. I just bought an 09 6.4, fantastic truck, leather,sunroof etc, but I only got 400miles on a tank, without towing! can anyone recomend a chip for this engine it made a massive difference in the 7.3. thanks for any advice