On the surface of it, you have multiple problems across multiple systems and components. But the root problem could be as simple as a poor earth or other electrical connection.

Modern, computer-controlled cars absolutely do not like an incorrect voltage across their electrical systems, so the problem could also be something like a battery in poor health which is forcing the alternator to work too hard and for other systems to go haywire due to incorrect voltage.

A close check of the car’s entire electrical system is probably a good place to start.

It all depends on how you define long and bulky. But no seven-seater is going to be exactly small, is it? That’s because, to accommodate the third row of seats necessary to seat seven a vehicle physically has to be a certain length and there’s just no getting around that.

But I take your point; a lot of the seven-seat SUVs out there do seem pretty big. Again, however, that’s not a bad thing if you plan to fill all three rows of seats and still have some room left for luggage. The smaller seven-seaters aren’t all that good at this as the third row gobbles up the luggage space, making these cars best for those who only need seven seats on an occasional basis. If that’s your situation there are lots of mid-sized seven seaters around, but they’re pretty much all SUVs.

And while it goes against your preference for a smaller vehicle, the very best seven-seaters aren’t SUVs. They’re usually people-mover vans such as the Ford Tourneo, Kia Carnival and VW ID. Buzz. In fact, some of these even seat eight. They’re also a lot better for accessing the rearmost row of seats and they’ll still have lots of luggage space even with all seats occupied. And, yes, they look big, but that’s physics for you.

In the meantime, you could look at slightly less bulky options including the Hyundai Santa Fe, Kia Sorento, Mazda CX-80 and Toyota Kluger. There’s also been speculation recently that Subaru’s seven-seat Tribeca might make a return to the Australian market.

Believe it or not, 17 litres is on the high side of things, but not out of the question in a Kluger that is driven exclusively in stop-start urban traffic. I know the official fuel consumption figure for the car is 11L/100km, but there are a few things to keep in mind with that. The first is that this is a combined urban/highway figure, so it will always be lower than the urban number. Also, this figure is achieved on a test that actually bears very little relationship with driving in the real world.

You need to keep in mind that this is a relatively large petrol engine, hauling a hefty (1900kg-plus) car around. If your Kluger is the all-wheel-drive version, there’s also a fair bit of driveline friction to overcome. Even when cruising down a highway, this will never be a frugal vehicle as the aerodynamics mean it’s moving an awful lot of air at 100km/h. Don’t forget, either, that driving style has a huge effect on how much fuel you use.

If you’re concerned, have the car tuned and serviced. Fresh spark plugs and clean filters might make a difference to your fuel use.