Daniil Kvyat says he endured a "reasonable" Friday en-route to setting the fifth best time in second practice for the 2015 F1 Spanish Grand Prix.

The Russian was limited to just seven laps in FP1, but went better in the afternoon and did 25 tours in total in the Red Bull RB11, far more than team-mate Daniel Ricciardo, who managed only 13 all day following a late decision to fit his fourth and final new Renault power unit.

"We didn't have so much mileage in P1, but we had a bit more in P2. We need to look carefully at the data now to understand where we can make the advantage," Kvyat said.

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"We have some upgrades on the car and we have been looking closely at how they work. We hope to extract even more tomorrow because when you have a new package obviously the car changes a bit and you always want to analyse how you want to set it up. Overnight we have plenty of work to do," he added.

"[Overall] I think we had a reasonable Friday. You never progress perfectly. We always want to try to go forward and move ahead."

Asked what the issue was in the opening session, Kvyat replied: "We just didn't do many laps for various reasons. We had to limit our running, but anyway we had a good P2."

So what is the best he can expect from the weekend?

"I don't know really. We are where we are at the moment. We just have to try and extract the maximum out of the car. The track usually in these conditions is quite tricky, so it is interesting. Let's see what we can do tomorrow in qualifying."