[Vekke]

Better LRR will give you better results than saving few kg even its rotating weigths.

Best way to test tires is to buy them used with the wheels. Try to find ones where you know their eu RR values. You can get sets even for 50euros or less.
Then just resell the ones which doesnt work well. In the end just put the best tires to your best wheels.

I would try 165/80R15 tires. Those I would install to 6,5" wide wheel
In most cases steel wheels with aerodynamic hubcaps is the best option.

You have the 1,8 hybrid so it can recharge batteries in braking so their weigth is even less important.

LRR helps in city and Cd helps in road. Narrow LRR wheels migth raise the max ev speed closer to 90 km/h. LRR gain also comes from higher tire pressures.