And here are my results with v1.7.2.10:
automatic:
{EXP:2 * 0.75}: 1,5
{EXPDECINV:2 * 0.75}: 1.5
{STATE_UICULTURE}: de-DE
{STATE_CULTURE}: de-DE
German:
{EXP:2 * 0.75}: 150
{EXPDECINV:2 * 0.75}: 1.5
{STATE_UICULTURE}: de
{STATE_CULTURE}: de
Plugins off:
{EXP:2 * 0.75}: 1,5
{EXPDECINV:2 * 0.75}: 1.5
{STATE_UICULTURE}: de-DE
{STATE_CULTURE}: de-DE