I've actually got two different reference sources on the L-1011.
The first, Lockheed L-1011 TriStar by Philip Birtles, pg 13 - economical cruising speed is Mach 0.85 - 490 knots
The second, TriJets by Robbie Shaw, pg 127 - max cruising speed of the L-1011 is listed as 520 kts, DC-10-10 is 501 kts.
img]http://www.cbnoble.com/images/OAlogo1.jpg[/img]
Based in MCO, DTW, BOS, SLC - Public World 3
Proud Member of United Sky Group