Formula E drivers are expecting the Valencia E-Prix to be one of the most difficult rounds of the season in terms of energy conservation, as the average can go up to 10% or more during the race.

Audi racer Lucas di Grassi said the Valencia race is “definitely [one of the toughest races] in terms of energy management, in terms of the percentage that you have to save to finish the race.”

The Brazilian says leading the race right off the bat could be a disadvantage, saying he expects drivers to follow the slipstream.

“If you stay behind, you definitely save energy. There is definitely a compromise between how much you save energy.

“You could see someone coming from last to first in five laps but they then go from first to lap in the last two laps.

“Here the energy-saving and balance of the car, it’s a different technique,” he said.

Sam Bird said: “This will certainly be the most difficult [race] in terms of hitting the figures. Yes, definitely.

“As a percentage of full-throttle time, normally the tracks we go to might be 64%.

“This is more like 54%. You really feel that. It feels like a massive reduction.

“Somehow we’ve got to find [the equivalent of] seven minutes of energy per race to finish.”

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