E-vignette? Oh, well, better luck next time... We do call ourselves Apsurdistan, and that's for a reason... Nope, we don't have such things, and the fees for our highways are similar to the gold price, they just magically rise and rise...
That's why the local people mostly use the good old coastal route, that one, however, is suitable just for the adrenalin junkies among the visitors.
https://en.wikipedia.org/wiki/D8_road_(Croatia)
Having said that, meanwhile the locals are on that D8 road to hell, all tourists/visitors are mostly between themselves on the other side, on that nice but expensive highway...
Now about the costs. It's expensive, too expensive if you ask me, but who am I do be asked anyway...
Cestarine - Putne informacije - HAK
Just select A1 Zagreb - Split in the first row and
Pirovac within the second row
and you'll get:
138 kn ~ 18,00 EUR for a simple Class I vehicle (nothing fancy, just a usual goddamn car...).
You can get laid and drunk for that very same money...
Hope that helps, or maybe not...