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My experience with a swap, from a 1.0L to a 2.4L, was that even with re-gearing, I lost around 40-50% fuel economy. Granted, it was an exceptionally efficient 1.0 with great gearing for economy to begin with, and the new engine makes the car near supercar quick. The new engine is really hard to drive at ten tenths though, and while it's a hoot, driving a slow car fast by wringing out everything a small engine has is pretty entertaining too. The extra utility the engine swap brought has a monetary value, but were I you, I'd rebuild the stock engine and maybe bump compression a hair, or go with a *very* small turbo. That has its own issues though - aftermarket turbos inevitably have leaks or things rubbing that cause ongoing maintenance.
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