Depends how you drive it.
Before I had my exhaust fitted....300 miles to a tank....afterwards...200...lol, it's addictive!
But between 200-350 miles to a tank depending on your right foot is how they work really
But if you need to ask mate....sure you can afford it?
Don't mean to rude by saying so, but they ain't a cheap car to run
Also insurance wise, try Adrian Flux, I was ?600 at 21 with mine