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Sounds like a tough driving environment. And jumping off/on the freeway is not the ideal scenario for the VX, with its tall gearing and lean burn qualities. It's ideal as a cruiser. I have heard too that a properly tuned turbo that delivers its boost at a low rpm range (1700-2200 rpms) can benefit FE. Ford's ecoboost engines do exactly that.
But the single best thing you'll do for your FE is adapt your driving style with instrument guided precision. Get an OBD2 car (not the VX) and buy an Ultra Gauge to monitor engine sensors and drive in the optimal throttle/load positions.
Good luck!
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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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