Mercedes team principal Ross Brawn has said his team remain focused on improving the long run pace of the W04.
Lewis Hamilton and Nico Rosberg claimed pole position for the last two races but were unable to convert them into victory, with Hamilton third in China and Rosberg only ninth in Bahrain.
"We've been working hard on improving our long runs and there are some signs of improvement today but we need to have a good look at the data this evening before making any conclusions," said Brawn.
"The car seems to be quite good on low fuel as we know. Tyre degradation is going to be a key consideration over the weekend and we must remain focused to ensure that we get the best possible performance from the car in the race. That's our priority."
Hamilton was sixth in both practice sessions, with Rosberg seventh in the second of the 90 minute sessions.
"It seems that we are quick again on one lap but we need to focus very much on achieving a good race pace," added the German.