I am running a 1994 Suzuki Swift GA Sedan with the 1.3L MT. Is yours the sedan also, or a hatch?
I started at around 45mpg Highway. I improved my highway MPG by 6 or 7% (to about 48mpg) by adding a grill block, some underpanneling, folding my passenger's mirror, and adding a wiper block. Later I got another 6% (to about 51mpg) by adding a SedanKamm.
I see you are looking at getting a Scangauge, but you can also look into the UltraGauge or the MPGuino.
Welcome to EcoModder.
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