Almost half of Tulo's away games have been played in NL West parks (247 of his 521 away games played) and he has, roughly, a .765 OPS combined in those parks. His overall Away OPS is .819. That makes his OPS at those four parks almost 55 points lower than his overall AWAY OPS. That means away from the four NL West parks he plays away games in, he's roughly 55 points higher than his overall AWAY OPS...around .870. Or, to look at it another way, around 100 point swing in OPS. Tulo's AWAY OPS is greatly affected by the amount of away games played in the NL West because almost half of his away games have been played in those parks, and in those parks he has a combined OPS in the .760s. It seriously drags down the overall AWAY OPS to .819. BTW, career wRC+ Home 131, Away 119. Not such a huge difference. Most players do better at home.