i have been watching the Scangauge mpg and gph while accelerating. My theory is, at a steady gph acceleration rate, I let the rpm's increase as long as the mpg keeps increasing every second or so as the Scangauge updates. When the mpg flattens out and no longer increases, I shift to the higher gear.
On a flat road, I accelerate at about 1.5 to 1.8 gph, preferably holding at 1.5 gph if I can. The rpm range of acceleration seems to work best from about 2300 to 2900 with my 1.6l Nissan Versa.
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