Jenson Button says that while McLaren have made a step forward in Barcelona, it hasn't helped them narrow the deficit to the leaders.
McLaren brought several upgrades to the Spanish GP in the hope of closing the gap to the frontrunners after falling off the pace at the start of the season.
Those included a new front wing, however, only Sergio Perez ran that and he did so just in the final few minutes of FP2.
Button's MP4-28, though, did sport other upgrades which the Brit reckons are a step forward.
However on the downside their rivals have also made steps forward, negating McLaren's progress.
"I haven't run the new front wing, we haven't had that on the car yet," he told Sky Sports News.
"There are some positives to the parts - there are some negatives as well, to the balance of the car.
"We have moved forward I think, but I think everyone has."
The Brit, though, was not able to quantify how big a step forward McLaren have taken.
"I don't know. We've had very limited testing today, it was the same for everyone.
"As I said, we don't have the front wing on the car - we're not sure if we will this weekend - but there's a lot of data to go through and things to change for tomorrow...looking at what is working and what isn't helping our balance."
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