To get 6% it must have a regulator, so someone is giving you wrong info.
6% isnt bad but you will need to do your own test upon purchase. I used
electric space heaters to easily and acuratly load it to full load. And
set it to 120v 60Hz at my normal loading. Look at other units, Yamaha
is worth a look. But a Honda EU can outlast anything at 50% load because
it will be turning 1800 rpm. 10000- 14000 hrs you could get running it
easy. Compare that to 2-3000 hrs for 3600 rpm units. Again Honda costs
2.5x more but can outlast all small units if run at low load because
amps are rpm dependant.