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The engine is a derivitive of the Corvette and Camaro engine. They choked it down for use in the trucks.
I would look to some traditional "power" modifications as means to allow it to breathe. Air intake, exhaust, headers. There is software, LS1 Edit, among others that will allow you to modify the code. Most use it to custom tune for higher horsepower applications, but it will also allow you to build your own MPG tune.
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Current MPG driver:
1994 Isuzu Rodeo - Beater with a Heater...
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