The DTAG VDSL2+Vectoring standard modem ("Speedport W 724V", I and some other people tend to call them shitport) pulls about this much in idle. The DrayTek VDSL2+Vectoring modem also pulls about this much.
It's been extremely useful for finding out how much power various equipment draws. For example, several of the "powered off" systems here - not sleep mode, just shut down via OS - still draw 4.5W+ continuously. Now I turn things off via the switch at the back of the power supply too. ;)
Mentioning this as you don't need to fork out heaps of money for (say) a Fluke meter. It's possible to get reasonably accurate consumer type.
(But, read the reviews first. There were probably 10+ other meters out there better priced... but most of them with reviews about their poor accuracy.)
Kind of wondering what "real world" measurements indicate. :)