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Turbos help diesels get better mileage. They can increase efficiency of a gasser, but, that means they will make more power at wide open throttle. This doesn't help you any at improving mileage at 60 mph. It all keeps coming back to that PITA throttle (which a diesel doesn't have). What good is it to boost the I/P pressure if the throttle will just close a bit? It's the same thing for CAI.
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