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I usually get 400km (250 miles) or even a little less on a tank. That's with roughly 80% city driving.
FWD models have a little bit of a range advantage as they have a larger fuel tank than the AWD and get slightly better fuel economy. The FWD tank is approximately 0.8 US gallon bigger. 700 km seems impossible for a petrol version of this car. I'm not sure how the diesel models fare as those are not available in the USA. When the fuel gauge reads the last bar, it is my understanding that there's still around 2 US gallons of gas in the tank. When I run it down until the "range" indicated by the computer is in the single digit miles and then fill up, it takes around 9.6-9.7 US gallons to fill it. Specs sheet says the tank is 11.9 US gallons for AWD models, 12.7 US gallons for FWD models.
Running through the math here... Converting units to 'merican imperial units because it makes more sense to my stupid 'merican brain:
700 km = 435 miles.
If we assume you can operate the car at an average of 40 miles/gallon for the whole tank, then 435/40 = 10.875 gallons. That would leave you plenty of gas (1-2 gallons!) left in the tank to make it to the next petrol station unless you find yourself in the outback (the place, not the Subaru, lol). Could be feasible with FWD and favorable driving conditions or a very skilled hyper-mileage driver.
With a FWD model and you use every drop of gas in the tank... The minimum fuel econ needed to go 700km = 435/12.7 = 34.25 miles per gallon average on the whole tank. Seems reasonable without having to put in a ton of effort. For AWD, the min becomes 435/11.9 = 36.55 miles/gallon. Still possible, but it'll take some effort and conscientious driving to do it, I think.
Do this in either FWD or AWD model will require ignoring any low fuel indicator warnings and you'll be going off reservation without any way to know how much fuel you've actually got left once you're down to that last 2 gallons. It'll be like how soccer (er, football... futbol?) has the mysterious "stoppage time" that no one really knows or understands how much is remaining besides the referee. I'm not even sure you CAN use every drop in the tank. Depends on where the fuel pump is pulling in the gas and it's not good to let those run dry.