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My '93 Sentra Xe got a best of 49.97mpg with a slight bleed of propane into the engine via propane injector. Most of the time the 1.6 would hit 37-39 all day long. My recently acquired 02 Sentra XE hits 41 almost every trip I make to work and back (30 miles) If you are running 55mph, it should be doable. Had you played with any mixtures of acetone in your tank? I say this because my 200mile acetone (2oz per 10 gal) test today bumped my mpg average up to 38 for a 200 mile trip 75-80mph.
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