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Sorry the car is not giving the performance you wanted. Let's have some more details about your car, though? Is it manual or automatic? You are keeping tire pressure up and not lugging around 100+ pounds of extra weight? Running the air conditioner heavily in the French summer? Any brakes dragging? How fast do you drive at cruising speeds on the highway. Also, maybe set up a fuel log on this site. It helps you and helps users here to advise, sometimes.
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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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