Might want to try a different EV, as those #s suck. Our MG ZS's WLTP range is 320, and we exceed that knocking around town (360 +/-), and meet or exceed on the highway, at 90 kph +/-
Example of that, O&A now, and home to first unscheduled 'P' break, and while there, a quick munch, and topped up, since didn't need much, and hate to waste a stop. That at only about 165 kms from home, as usually don't think about charging till 225 kms, then hit one before 250 kms, as that's 3+ hrs on the road.
But that first stop was a bit early, and we averaged 83 kph, actually good for TH. Using 14.2 kWh/100 kms = 326 kms range on full battery. Based on real life experience, yesterday.
By your estimate, I shouldn't go further than 160 kms round trip, and I we have no problem going 250, with nice reserve when back home. We pop up to Hua Hin quite a bit, and it's 200 kms r/t, and we always return with at least 1/3 battery/100+ kms remaining range.