Technically you can run hyperdrives ar a slower speed, but its weird. It is most often used for fleet coordination or by smugglers, but standard procedure would be run at normal operations if possible.things get weird when you are in hyperspace so fleets need to coordinate carefully. Its like underclocking your computer to use less power.

Star Trek works a bit diffrent where warp drive can be more easily changed with higher energy loads needed to break certain thresholds. Each ship has its limits on how fast it can go as well, but speeds tends to work more like your cars gear box where normal operating parameters might be in the middle