I'm 100% with dirtydave on the Scangauge. Being able to see instant data readout is crucial. That data allows you to modify your driving style to greater extent on the fly.
Case in point, my ZX2 was cruising yesterday at the same speed, but dependent upon my throttle, getting between 37 and 43 mpg. Being able to see that I am getting 43 instead of 37 adds up quick.
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