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I have found in practice that instant MPG displays are next to useless. The only time they give you any useful data is on flat ground at perfectly constant speed (i.e. with cruise control on). Any wind, slight incline, or the slightest acceleration or deceleration will give you bad data. There's no way to judge how efficiently you accelerate, coast, no way to get any data at all unless you are on flat level ground at constant speed.
I had hoped that the scangauge was smart enough of a tool to have figured this out... but it was mostly useless. It has instantaneous MPG and trip MPG and no other options. The rolling average is what's really useful, and a combination of trip MPG and tank MPG is very useful as well. I sold my scangauge after a year or so... waste of money.
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bryan1980 
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