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is there any gain on economy? what is purpose of economy tune? on high octane tune how much horsepower increase? does fuel milaege increase? i have 07 NBS REG CAB 5.3 4WD 3.73 REARS . and why does the programmers give the deisels such a more significant boost than the gas engines? sorry for all the questions as i am new to tuning. thanks any advice is greatly appreciatted. Ray

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