Stay out of boost. Do what ever it takes to keep the engine from making boost. More PSI in the intake manifold the more gasoline the computer is going to inject into the engine.
I've owned an 81 Volvo 242 Turbo, 86 744 Turbo, and I'm running a 87 745 Turbo (362K) as my daily driver. Turbo gasoline engines are not the best way to increase gas mileage.
Turbo's on Diesel's are great way to increase power and fuel economy.
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