iV80 driver me. Just returned from round trip Wiltshire - Perth 900 miles all motorway or dual carriageway.
Mostly stuck to 65 mph, occasional excursions at higher speeds to clear bunches of trundlers. Daytime journey with outside temperatures ranging 11-21 degC, A/C on and temperature set 20 degC. Efficiency overall was 4.2 mpkWh.
Two stops each way for charging and found like most, that you've really got to bolt the coffee if you are to disconnect and proceed! Unbelievably convenient fast chargers at Stafford and Gretna Green. Return journey started at 80% charge, arriving home with 40%. Journey times around 10 hours each way and not much different from those in Octavia and Superb diesels driven many times previously tbh .
April's other longer journey Wiltshire - Cornwall returned around 3.8-3.9 mpkWh this year. After 15 months since ordering, the car arrived January and I am delighted with the range which consistently exceeds 340 miles this June weather weather and 310 Feb - March. Enyaq iV80 well recommended for your needs!