Depends. Urban expressways I'll usually go the speed limit. Rural expressways I'll go anywhere from 8 mph under to 4 mph over. Rural interstates here have a speed limit of 70 mph. But for fuel economy reasons, I try to go only 100 km/h. (Roughly 62 mph, and I choose that because it usually keeps me from being the same speed as other slower drivers.) However, if I'm running short on time because I got delayed either before setting out or while driving, I'm willing to go 120 km/h on the rural interstates. That ability to still make it someplace on time when delayed is another reason for planning on 100 km/h.
You are endangering your life to potentially save $1 in gasoline. Excessively slow drivers (anything below the limit in normal conditions) are such a menace.
Poll
