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Any tool such as the Scangauge can only help you adjusting your driving style to become more fuel efficient if that is your goal. In terms of actual MPG or distance left it is always based on average used so far and always only an estimation. it can get close but will never be exact. The more you "teach" the unit (aka adjust the actual gallons used at each fillup) the more acurate it will be. But what if you suddenly have a chance to coast for a long period of time just before your empty would come on. The range calculated was based on what your doing since the last fill up and now your driving might be completely different.
My actual calculated MPG based on fill up is alwyas less then what my SCII shows. Just my observation and I could further adjust the settings on the SCII with the help of a GPS etc I know but for me it does what I need. One indicator for me is when the MPG hits 80 I will shift to neutral and coast. I can see if I improved on my daily commute versus the day before etc. love the SCII but would really on it for actual MPG calculation for a whole tank or lifetime etc.
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