Daniel Ricciardo is confident that Red Bull "should be closer" to Mercedes come Saturday's qualifying for the British GP.
After a sluggish start to the weekend, the Aussie showed better pace in Friday's second practice using the medium Pirelli tyres.
Clocking a 1:35.511, Ricciardo finished in fourth place, 1.003s off the pace set by Lewis Hamilton.
"Today hasn't been too bad," he said. "Mercedes were really strong this morning but we seem to have found some more speed this afternoon.
"With the Prime, it was really good but with the Option we didn't find enough time so, if we analyse tonight and get it right, then tomorrow we should be closer."
Like many of his rivals, Ricciardo admitted that the wind played a role as it impacted the balance of the cars.
"The wind here is always really strong and today in particular we had really strong gusts coming through and it changes a lot between the corners, you know one corner you feel like the car is really sharp and then another corner you feel like it doesn't have any grip at all.
"So that's a bit complicated, but same for everyone and it makes it a little bit more interesting."