Since you already have a Unicorn, you could stick with Honda and get either a new Unicorn or its more stylish sibling, the SP160. Both are mechanically very similar, with the differences boiling down to features, seating ergonomics and a small price difference. These will return good fuel economy and also be reliable in the long run. It is an important thing to consider since your last bike is 17 years old.
If you want to look elsewhere, bikes like the Bajaj Pulsar N160, TVS Apache RTR 160 4V and Yamaha FZ models are worth considering. Of these three, the FZ has the best fuel economy but is the least engaging to ride. The Pulsar and Apache have slightly lower fuel efficiency but offer you more comfort, power and features.
A test ride should help you decide which is the right bike for you.

