Small update - first tank was 52 MPG which is kind of close to the Prius at 50-ish. The second tank includes a longer journey which resulted in 60+ MPG on the in car display - we will wait and see what the total tank is.
Comfort on this longer journey was rated as not so good - hot weather and furry-ish leather seats.
I'm empathising on the downsides as of course we might swap...
