Article in the Enquirer from John Erardi:

Mike Leake may not need to be “shut down” as early as some prognosticators think.

The Reds’ 22-year-old wunderkind, who came straight to the major leagues out of Arizona State, is the most efficient pitcher in baseball under the age of 25.

He ranks 17th in the NL, and best on the Reds staff — slightly better than the pitch-efficient Bronson Arroyo, a pitch-and-a-half better than Johnny Cueto and over two better than Homer Bailey and Aaron Harang.

Here are the Reds starters and their average pitches per inning:
Leake…………..15.4
Arroyo…………15.7
Cueto….……….16.8
Bailey…………..17.7
Harang……….. 18.0

There is no set figure on how many pitches or innings a young pro pitcher should be allowed to throw in a given season, but Sports Illustrated’s baseball writer, Tom Verducci, did some research that suggests that pitchers under 25 years old should not be allowed to pitch 30 or more innings in a given year than they did the previous season.

Article makes some interesting comparisons between Leake and Greg Maddux.