Renault is apparently working on a Clio-sized concept car featuring a plug-in hybrid powertrain that delivers an average fuel consumption of 2 1/100-km (141 mpg UK/117.4 mpg US).

Remi Bastien, Renault head of research, advanced studies and materials, told Auto Express that the carmaker is “investigating petrol plug-in hybrid power” for the prototype “2l/100km” vehicle, which may debut at the 2014 Geneva Motor Show.

He added that Renault's concept may preview a production version. “An eventual production version of the car would be affordable. It will be a B-segment car with Clio-type features in terms of space and comfort,” the executive said.

He didn't, however, disclose if the plug-in hybrid would be based on the Zoe electric vehicle. No details were offered about the powertrain except the 2l/100 km target.

“The main thrust of our research and development budget is spent on improving emissions – with our electric vehicle strategy with the Zoe EV, we’re perfectly placed to develop hybrid systems,” Bastien said.

The French carmaker will continue to work on zero-emissions research projects with the aim of improving practicality and range. Bastien says that battery technology will advance significantly in the near future as the industry is only at 50 percent in terms of exploration of battery technology.