Renault say they are encouraged by their progress after three of their cars finished in the top 10 at the Chinese Grand Prix.
Red Bull drivers Daniel Ricciardo and Sebastian Vettel finished in fourth and fifth, while Toro Rosso's Daniil Kvyat took the final point for 10th place.
"Three cars in the top 10, with the potential for four, at a power sensitive track such as China is a good result for the weekend," said Renault's head of track operations Remi Taffin.
"While we have some way to go, we have made good progress across all our partners on energy management with the balance between ICE [Internal Combustion Engine] fuel usage and energy recovery allows the teams to extract close to the maximum performance from their packages."
Taffin nonetheless remains aware that Renault can make further gains before the Spanish Grand Prix next month.
"We acknowledge we still have some further steps and need to consolidate the reliability we have developed, but we have three weeks before the Spanish Grand Prix and another intensive programme to build on this weekend," he said.
"The trend is now there and we fully intend to stay on this curve."