Cruising speed
Cruising speed (also known as cruise speed or cruise velocity) was a warp speed of a starship which could be ly maintained over a period of time without sacrificing optimal efficiency. This was typically less than maximum warp speed.

In 2151, the standard cruising speed of an  starship was warp 4.5. ()

By 2153, warp 5 had become a sustainable cruising velocity that could be maintained for long periods of time for ships using the warp five engine. ()

In the 2250s, the Rigel system was several weeks away from the Vega colony at the maximum cruising speed of a  heavy cruiser. () 

In 2268, extensive modifications were made to the  by the Kelvans, who were able to produce velocities that were far beyond the reach of Federation science, allowing the Enterprise to safely maintain a cruising speed of warp 11 while traveling through the intergalactic void. ()

In 2285, a Class III neutronic fuel carrier had a maximum cruising speed of warp 3. ()

In 2371, the  , had a variable warp nacelle configuration, which gave it a maximum sustainable cruise velocity of warp 9.975. ()

Ferengi shuttles were extremely fast and durable warp-capable vessels, fast enough to outrun Romulan interceptors. According to Rom in 2372, they were capable of flying half way through the Milky Way Galaxy before even needing a maintenance checkup. It was possible to exceed the maximum safe cruising speed by 0.3 warp factors. ()

According to the EMH Mark II in 2374, the  was capable of a cruising speed of warp 9.9 and no other ship in Starfleet could do this. ()

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Measurements
Warp