I got a manual 1.6 Corolla for my daily (1997 model) lots of fun, surprisingly nippy, drives at 110kph no probs, comfortable as, cheap to run and costs almost nothing to buy. There are1.3's also.
Fuel economy is more than just cc's. A light car will use a whole lot less as well as driving style and gearing. You could get a 660cc thing that you have to thrash to get to 100 and then its sitting at high rpms when you get there due to probably having only 4 gears.
Keen to hear what you get