Moyer was in his own world.
Kendrick was 89-90
Lee was between 91-92 in his peak years
Hamels was a tick below 91 in 2008-09, then his velocity jumped to over 92 in 2010
Blanton was 89-90
Worley was 90
Halladay was 92 most of his career, but was still highly effective in 2006-07 when his velocity averaged barely above 91
Happ was 90 with the Phillies, gradually rose over his career to where he's now 92-93 (see this with a number of pitchers, velocity rising as they physically mature and perfect their pitching mechanics)
Myers was 91 when he started out, fell to 90 in 2008 and 89.3 in 2010 (best season of his career)
Pitching leaders:
Last year (30) SP over 93, (14) 92-93, (11) 91-92, (9) 90-91, (8) <90 - 74 total that qualify, 48 over 92 MPH.
Under 90: outside of Dickey, Weaver (0.0), Fister (1.1), Iwakuma (2.4), Tomlin (1.0), Estrada (3.0), Hendricks (4.5), Kuechel (2.7), [2.1]
90-91: Straily (1.1), Davies (2.7), Colon (2.9), Fiers (1.8), Wainwright (2.9), Hellickson (3.2), Smyly (2.0), Maeda (3.2), McHugh (3.1) [2.5]
91-92: Shields (-1.1), Garcia (1.2), Miley (1.5), Nolasco (2.6), Eickhoff (2.9), Leake (2.5), Bumgarner (4.9), Pomeranz (2.9), Teheran (3.2), Tanaka (4.2), Santiago (0.5) [2.3]
92-93: G Gonzalez (2.8), Sabathia (2.7), Porcello (5.1), Lackey (3.1), Odorizzi (2.1), Quintana (4.7), Cueto (5.5), Hammel (1.5), Happ (3.2), Kennedy (1.6), Bettis (2.5), Finnegan (0.3), Koehler (1.1), Tillman (2.4) [2.8]
93+: Lester (4.3), Roark (3.2), Graveman (1.7), Kluber (5.1), Santana (3.2), Sale (5.1), Hamels (3.0), Moore (2.3), Price (4.4), Stroman (3.6), Liriano (0.5), Perez (1.9), Nelson (0.7), Rodon (2.6), Volquez (1.4), Arrieta (3.8), Verlander (5.2), Bauer (2.7), Samardzija (2.7), Archer (3.2), Scherzer (5.6), Ray (3.1), Sanchez (3.9), Duffy (2.7), Gausman (3.0), Gray (3.6), Fernandez (6.2), Ventura (2.6), Martinez (3.3), Syndergaard (6.4) [3.3]
Under 90 MPH (average) it's really hard to be a ML starting pitcher, it can be done, but it requires exceptional command and/or secondary pitches, that's why I use it as the "Mendoza" line for pitchers.
90-91 are mostly #3 to #5 starters, you can make it work but there's a limited margin of error, which is why I use 91 MPH as the cutoff, below that it's hard to be a consistent ML starter
93+ is where the majority of top starters are located, which isn't exactly a surprise, but 11 of 30 were less than 3 WAR, so it's no guarantee of excellence.
Pivetta averages 94.6, Velasquez 94.2, Eflin 93.7, Nola 92.4, Lively 91.6, Thompson & Leiter 91.3, Eickhoff 90.4