Gas in Europe is $8 a gallon consequently people don't buy petrol engines US market petrol guzzlers!

The Q7 is a fine automobile - its consumption isn't low but its not a deal breaker either.
Word of caution a shiny all new q7 will be released next year or later this year - The Cayenne and the Touareg have been replaced (q7's older brother and father respectively) with lower consumption and substantially less weight!

We're obviously very uncool (and maybe cheap) no fancy brands for us - we just bought a Ford S Max 7 seater. I am sure it's smaller than some of the monster cars mentioned but I have still had trouble parking it in many underground car parks out of town and new buildings. It's taken me a while to get used to the width. But it does have 3 proper full seats in the back although I haven't tried 3 car seats just two with an adult very comfortable in the middle of them

But after not driving for 6 years since moving here I find it a nice easy drive and after a couple of days I was used to driving on the other side

I think a conventional, diesel, latest generation people carrier will fit all the OP's requirements then some, saving them a lot of cash in the process, both in running costs and outright purchase. They'll be easier to park too.

Of course, if "status" is important, get the q7.