Romain Grosjean was frustrated after yet another Renault engine problem cost Lotus track time in Bahrain.
Taking over from team-mate Pastor Maldonado on Wednesday, Grosjean managed just 16 laps before an issue with his Renault engine put paid to his running.
It was the second time in as many days that a problem with the engine curtailed Lotus' test as on Tuesday Maldonado also covered only 16 laps.
"I have to say that these two days have been quite tough on all of us," Grosjean told Crash.net. "We were hoping for more, but again they say China or Barcelona will be a good step forward. Let's see.
"I think we are already quite a long way behind. With a perfect qualifying...
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