If you're going to be spending a lot of time at 80 mph you should aeromod your car to reduce its aerodynamic drag, engine load, and improve its mileage at those speeds. My extensively aeromodded Civic CX with a VX engine gets low 60's mpg at 80 mph, so there is a lot of room for aerodynamic improvement over the stock VX if you are willing to modify its shape.
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