Just bouncing between my three profiles on the same Tacoma and same days the platinum yields $49/day discounted from $54.... The gold just shows a flat $42/day with no standard charge it’s discounted from and the world elite platinum yields $40.71 discounted from what it says is $44.

Clearly the algorithm is not just odd, like much else about Sixt, its manipulating the standard rate as it calculate discounts. super strange.