Somebody posed the question of how Chris Carpenter does after 5+ days off a long time ago on a game thread.  I had time this morning, so I looked it up thought this was worthy of a fan post...so here goes:

This does not including games coming off of the DL or opening day games because I believe it would throw off the numbers a bit since those are closely monitored pitch count type games, usually.

2009

5 days rest

June 20 - STL @ KC - 7 2/3 IP, 3 hits, 1 ER, 6 K, 2 BB (105 pitches)

August 7 - STL @ PIT - 8 IP, 9 hits, 4 ER, 4 K, 1 BB (111 pitches)

6 days rest

July 17 - ARIZ @ STL - 8 IP, 7 hits, 0 ER, 7 K, 1 BB (103 pitches)

2008

5 days rest

August 5 - LA @ STL - 5 IP, 3 hits, 0 ER, 2 K, 0 BB (51 pitches)

2006

5 days rest

April 14 - CIN @ STL - 8 IP, 4 hits, 1 ER, 6 K, 3 BB (114 pitches)

July 4 - STL @ ATL - 5 IP, 4 hits, 2 ER, 2 K, 1 BB (74 pitches)

July 25 - STL @ COL - 7 1/3 IP, 7 hits, 0 ER, 4 K, 3 BB (112 pitches)

August 15 - CIN @ STL - 9 IP, 4 hits, 0 ER, 6 K, 0 BB (107 pitches)

August 26 - CHC @ STL - 8 IP, 2 hits, 1 ER, 5 K, 1 BB (100 pitches)

September 1 - PIT @ STL - 9 IP, 3 hits, 1 ER, 8 K, 0 BB (102 pitches)

6 days rest

June 13 - STL @ PIT - 7 IP, 3 hits, 0 ER, 13 K, 3 BB (111 pitches)

2005

5 days rest

April 16 - STL @ MIL - 6 2/3 IP, 5 hits, 3 ER, 5 K, 3 BB (101 pitches)

April 27 - MIL @ STL - 7 2/3 IP, 8 hits, 3 ER, 12 K, 0 BB (118 pitches)

May 18 - STL @ PHI - 6 IP, 5 hits, 3 ER, 7 K, 4 BB (99 pitches)

May 29 - WASH @ STL - 7 IP, 8 hits, 3 ER, 8 K, 0 BB (108 pitches)

June 14 - STL @ TOR - 9 IP, 1 hit, 0 ER, 10 K, 1 BB (95 pitches)

June 20 - STL @ CIN - 8 IP, 4 hits, 1 ER, 8 K, 2 BB (109 pitches)

July 1 - COL @ STL - 7 2/3 IP, 5 hits, 0 ER, 9 K, 2 BB (112 pitches)

July 28 - STL @ SD - 7 IP, 5 hits, 3 ER, 5 K, 1 BB (109 pitches)

August 13 - STL @ CHC - 9 IP, 8 hits, 2 ER, 8 K, 0 BB (109 pitches)

August 19 - SF @ STL - 8 IP, 9 hits, 4 R (3 ER), 5 K, 0 BB (94 pitches)

10 days rest (first game after All-Star Break)

July 17 - HOU @ STL - 9 IP, 3 hits, 0 ER, 9 K, 0 BB (97 pitches)

2004

5 days rest

April 29 - PHI @ STL - 7 IP, 3 hits, 2 ER, 7 K, 3 BB (89 pitches)

May 15 - FLA @ STL - 7 1/3 IP, 4 hits, 0 ER, 5 K, 2 BB (92 pitches)

May 21 - STL @ CHC - 6 IP, 8 hits, 3 ER, 4 K, 0 BB (88 pitches)

June 18 - CIN @ STL - 7 1/3 IP, 6 hits, 3 ER, 7 K, 1 BB (103 pitches)

June 24 - CHC @ STL - 8 IP, 7 hits, 0 ER, 9 K, 1 BB (120 pitches)

July 5 - CIN @ STL - 7 1/3 IP, 5 hits, 1 ER, 8 K, 0 BB (100 pitches)

July 11 - CHC @ STL - 3 2/3 IP, 9 hits, 6 ER, 6 K, 2 BB (72 pitches)

July 30 - STL @ SF - 6 2/3 IP, 7 hits, 4 ER, 3 K, 2 BB (86 pitches)

August 5 - MON (WASH) @ STL - 8 IP, 4 hits, 1 ER, 7 K, 1 BB (108 pitches)

August 26 - STL @ CIN - 8 IP, 3 hits, 1 ER, 11 K, 1 BB (122 pitches)

September 1 - SD @ STL - 7 IP, 6 hits, 1 ER, 5 K, 1 BB (104 pitches)

September 12 - STL @ LA - 5 IP, 8 hits, 6 R (5 ER), 6 K, 1 BB (109 pitches)

September 18 - ARIZ @ STL - 3 1/3 IP, 3 hits, 0 ER, 2 K, 0 BB (47 pitches)

---(got injured for remainder of year/playoffs in previous game)---

6 days rest

May 28 - STL @ HOU - 8 IP, 2 hits, 0 ER, 4 K, 3 BB (115 pitches)

7 days rest

July 19 - STL @ CHC - 8 IP, 12 hits, 4 ER, 5 K, 0 BB (97 pitches)

8 days rest

April 23 - STL @ MIL - 6 IP, 5 hits, 1 ER, 5 K, 2 BB (85 pitches)

9 days rest

August 20 - PIT @ STL - 7 IP, 7 hits, 3 ER, 9 K, 2 BB (108 pitches)

Here are the averages for the following amounts of days rest between starts:

Based on this data, I would conclude that Carpenter is significantly better than normal (a third of an IP more per game, more than half a hit less, more than a quarter of an earned run less, and over 1.5X the K:BB) with 5 days rest, however the effects do not always carry over when pitching on more than 5 days rest.