And yet, there is more

For the sake of completeness, here are the road splits for every MLB team, ranked by decreased home to road era (the differential in parenthesis) along with their home stadium factor (the second parenthesis):

Pittsburgh 2008: Home ERA 3.75, Road ERA 6.59 (+2.84) (98)
Twins 2008: Home ERA 3.32, Road ERA 5.69 (+2.37) (96)
Tampa 2008: Home ERA 2.87, Road ERA 5.05 (+2.18) (100)
San Diego 2008: Home ERA 3.38, Road ERA 5.10 (+1.72) (91)
Milwaukee 2008: Home ERA 3.36, Road ERA 4.95 (+1.59) (101)
Dodgers 2008: Home ERA 3.35, Road ERA 4.51 (+1.19) (105)
Cleveland 2008: Home ERA 3.57, Road ERA 4.75 (+1.18) (102)
Oakland 2008: Home ERA 3.01, Road ERA 4.02 (+1.01) (93)
Mets 2008: Home ERA 3.57, Road ERA 4.58 (+1.01) (96)
Boston 2008: Home ERA 3.45, Road ERA 4.27 (+.82) (105)
Reds 2008: Home ERA 4.05, Road ERA 4.85 (+.80) (105)
Toronto 2008: Home ERA 3.24, Road ERA 3.95 (+.71) (99)
Colorado 2008: Home ERA 4.35, Road ERA 4.97 (+.62) (108)
MLB 2008: Home ERA 3.89, Road ERA 4.48 (+.59) (100)
Kansas City 2008: Home ERA 4.20, Road ERA 4.75 (+.55) (104)
Seattle 2008: Home ERA 4.41, Road ERA 4.95 (+.54) (96)
Cubs 2008: Home ERA 3.44, Road ERA 3.92 (+.48) (105)
Atlanta 2008: Home ERA 3.52, Road ERA 3.98 (+.46) (96)
White Sox 2008: Home ERA 3.31, Road ERA 3.70 (+.39) (105)
Philadelphia 2008: Home ERA 3.71, Road ERA 4.04 (+.33) (104)
Baltimore 2008: Home ERA 4.20, Road ERA 4.47 (+.27) (102)
Marlins 2008: Home ERA 4.37, Road ERA 4.55 (+.18) (97)
Detroit 2008: Home ERA 4.53, Road ERA 4.59 (+.06) (101)
Texas 2008: Home ERA 4.96, Road ERA 4.92 (+.04) (100)
Yankees 2008: Home ERA 4.13, Road ERA 4.10 (-.03) (99)
Giants 2008: Home ERA 4.45, Road ERA 4.36 (-.11) (100)
St Louis 2008: Home ERA 4.16, Road ERA 3.89 (-.27) (99)
Nationals 2008: Home ERA 4.80, Road ERA 4.41 (-.39) (100)
Houston 2008: Home ERA 4.95, Road ERA 4.20 (-.75) (99)
Arizona 2008: Home ERA 4.32, Road ERA 3.45 (-1.13) (106)
Angels 2008: Home ERA 4.44, Road ERA 3.21 (-1.23) (100)

What is clear from this is that, surprisingly, there is no correlation between home/road ERA differential and park factor of the home park. There are 3 teams, Pittsburgh, the Twins and Tampa Bay, which have really bad home/road ERA differentials this year. It's all about planning, managing and coaching. The current Pittsburgh and Tampa Bay managers and coaches have been regarded as 'not that great'; however, the Twins manager, has been regarded as 'one of the best in the game'. Who lies? numbers or opinions?