The web speed chart readings do often differ significantly from performance in game, depending on fuel and weapon loadouts.
This chart was made by testing the most popular LWMA level bombers at four different altitudes from 15-30k. Bombers without 30K entry can't reach that altitude in reasonable time or at all.
All bombers speeds were measured with 50% fuel, full bomb load (except Mossie, which was tested without external stores; and one B-29 setup with 10,000lbs bombload). As I was looking for max cruising speed for that loadout, no WEP or takeoff power was used.
