I have a 90Tce stepway and had one for 6 months and 12k-ish miles. Over this 6 months I have averaged just under 10 miles per litre on a fairly even mix of a class, dual / motorway and town driving.
For motorway cruising, 65mph seems to be the sweet spot, low wind noise, engine sitting at 3,000rpm and fairly quiet. much above 75mph and the car starts to struggle.
Overall very happy with it and would buy another / recomend them. Swallows up ample stuff nd I’m fitting a towbar this weekend for bike rack / small trailer use which should increase it’s utility.