My first tank chasing the Scangauge live MPG figure gave me a decent increase (69.5 mpg compared to 55 and 60 on previous fills, same route) - but at the cost of speed!
My car has a live bar topping at 60 mpg, but now I can focus on rolling along at 90-120 mpg on some sections of my route. These figures are just guesstimates, as they are provided by my Hyundais computer, and it is always wrong - but give me a useful sense of bad, good and better styles of driving, gears and speed. My car told me to expect 74.8 mpg when that 69.5 was the true figure.
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