I am not convinced that the mpg will improve with the addition of turbocharging to the 3.6L engine. My understanding is that turbocharging is the equivalent of force feeding the engine to get more power. Along with the increase in air supply by the turbo charger, there is an equivalent increased use of gasoline when the turbo charger spools up. I could be wrong, especially because my basic knowledge of turbocharging comes from my father's explanation of the system in his 1987 Buick Grand National. My understanding is that mileage gains can be achieved if a much smaller displacement engine is turbo charged in order to replace a much larger gas guzzling non-turbocharged engine.