Welcome to both of you, Maddact and Abhishikha.
A Subaru Fiori? Like this one?
There would be a lot of room for aero improvement on it for your 40km commute. A chop top would be cool looking, I'd bet, but it's really pretty expensive I hear. You could start with the low hanging fruit, like wheel well skirts on the rear wheels, and airdam, pumped up tires, and slowing down to speedlimits or just under when safe. The big gains are always to be had, it seems, in extending the back with a "boat tail." That's a big job, but not as big as chopping and this particular car, with that big square back, would likely benefit a lot.