It all depends on you.
Some even find a 1000cc cultus too fuel heavy for daily driving. While some run V8s as dailies.
You're likely running a 20-year old non-VVTI 2JZ-GE pulling 1.5 tonnes of steel. Expect inter-city average of 8 km/l.
Also, crown is both wider and much longer than the average car here. So if you live in a congested city, it will be painful lugging it around.
In addition, spare parts are very hard to find. The ones you do find are crazy expensive. And there's a limited number of mechanics who do proper work on these. And they will rightly charge accordingly.
Having said that, the ride comfort and experience is something you'll only find in the likes of similar mercs and beamers.