Daniil Kvyat and Jean-Eric Vergne have called on Toro Rosso to find out why both drivers had to save fuel heavily throughout the Russian Grand Prix.

After an encouraging qualifying session saw both drivers start in the top ten on the grid, they immediately started dropping back in the race as a result of having to fuel save from the opening laps. Kvyat - who dropped from fifth to 14th at his home race - said answers need to be found before the end of the season.

"It was a tough race," Kvyat said. "Apart from the fact that I could not find immediately the right grip, we had to care too much about our fuel consumption compared to the others. This is something that we will have to understand, so as not to lose performance for this reason in the future.

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"Last but not least, I also had to pit again towards the end of the race, losing even more positions. I would have liked to do much better here in Russia, in front of my own crowd, which really made me feel their great support. Regardless of the disappointing final result, it was great to race in such an amazing structure, with an excellent organization."

Vergne agreed with his team-mate that Toro Rosso needs to investigate its high fuel consumption compared to its rivals.

"It was an extremely frustrating race. We have to understand why we had to save so much fuel. It's a real shame because the guys did an excellent job giving us a very good car, which I felt was great for the whole race. The start was very positive, we were attacking as much as possible but then I had to stop doing it, even though I felt I could really do a great job. We have to move on to the next race in Austin, where hopefully we will be able to extract the maximum out of the car."