A bigger turbo on your existing engine will not save you fuel. I'll do the opposite, probably. A bigger turbo with a swap to smaller engine might save you fuel, like the eco-boost idea (not unique to Ford).
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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