2016 dsl Canyon Actual Milage vs Indicator
 

I am noticing 6%-8% difference in my actual milage, manually measured, vs what the indicator tells me. It is not in my favor. Anyone else seeing this issue? Thanks.

Are you talking dash reading V's actual, or fuelly calculations V's actual? If you're going off your dash reading, they are almost always optimistic, most within the percentage range you mention. Mine is about 5-10% optimistic too, but no doubt some of that is the fuel filler calibration too. There are more in depth topics of this on fuelly, search "dash V's actual" in the search box ;)