How efficient is Bajaj Boxer on fuel when compared to the modern budget bikes?

During the Bajaj Boxer's heyday, it was reportedly one of the major selling points of the vehicle — the impressive fuel efficiency. But engine technology has come a long way since then, and today’s bikes have fuel injection, better combustion efficiency and more. How does the old Boxer stack up against today’s budget friendly options in real world fuel consumption? Think about things like how conditions can change in terms of riding, how things have changed with maintenance and how expectations for fuel efficiency have changed over time. Do the lessons of the Boxer's design still hold for modern manufacturers, or has technology advanced to the point where nothing could possibly be learned from the old carbureted engine?