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Adding a turbocharger is not going to help FE unless you [at least] change final drive ratio, transmission shift points & lock up strategy, etc. - all things that be beneficial without a turbo anyway. Like already mentioned, a turbo only helps FE when the engine is downsized.
Why not do something ridiculous: disable half your engine (remove one bank's pistons and valve train), as this has been proven to increase FE, and turbocharge your remaining 1.9L 3-cylinder to gain some of the power back.
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