I think you are being highly optimistic, borderline misleading.
Mid 30's mpg or higher??????
Sure, if you cruise on the motorway and reset the trip computer, it will show mid 30's mpg. But a realistic conservative mpg will be about 24-26 mpg. Less if you only drive about town.
He makes a good point - mid 30's is possible but only on a 1 off journey - you need to be thinking about combined motoring....mid twenties would be a good figure. We only get low 20's/upper teens because the drive to work is only 3 miles.