All of them that it is
I would reckon after 110+80 you should defiantly have movement (would have expected it after 110 really, however)... if not you want that fixed promptly.
If it does move it maybe useful to keep track of distance and the amount of fuel you put in at the next fill and the gauge position - maybe it needs calibration/adjustment/fixing... I would make mention of it at the next service at the least.
I mean if you fill up half a tank worth, but the gauge showed you 3/4 full - then how can you be sure you won't suddenly be empty with just under 1/4 per the gauge. For 'belts and braces' the fuel can idea might be useful - though I suspect not required for your 80mile drive (you shouldn't be any where near empty yet) - if you aren't sure you trust the gauge.
It possibly is worth noting the fuel gauge seems to be 'conservative' at both ends of the range - if filling and/or brimming the tank I have noticed the gauge stays at 'F' for what seems to be ages (but not 110 miles worth) before it starts moving down, and members have reported driving until 'Empty' (fuel low indicator flashing, dashes for DTE, etc.) before filling and, based on filling/brimming, calculating they still had 5-10L left.