Your dash guage is in litres left in the tank to the 10th of a litre? WOW! I got to get me one of those...
The digital one is more accurate simply because it is digital. There is no indication of how many litres are left on the analog needle guage PLUS because it's a guage it can't possibly be that accurate. Interestingly enough having never had a problem with the needle guage EVER last thursday after I filled up the needle didn't go all the way to full... Now when I fill up I REALLY fill up, like all the way to the fuel cap, I'm not a "first click and it's full guy"
lol
So I turned the car off, went into the hidden menu, found the digital readout and it said 75 litres left. Meanwhile the analog needle was sitting just about three quarters. So yes, the digital readout is MUCH more accurate if for no other reason than IT IS DIGITAL!!!