Have added a further 900 miles over the past three weeks which includes a number of longer journeys. Indeed did a round trip of 360 miles today which was principally on Motorways. After todays refuelling I can report 81.98mpg, which is well below my previous figure but relates to these longer journeys using the ICE. When electrical charging cost on the period is converted to a petrol cost the overall mpg works out at a reasonable 60.47mpg.
One point I have noted is that the petrol fuel gauge is pessimistic in that it showed one sector, HV showed 0 miles but there was still 4 gallons in the tank!