Adrian Sutil concedes this year's Championship could be "more like endurance racing" due to the new limit on fuel.
One of the many changes drivers will have to adapt to this season is the new 100kgs fuel limit for each grand prix.
At almost 60kgs less than what they used last season, many are predicting that drivers won't be able to race flat out with Sutil likening it to endurance racing.
"The highest sporting challenge would be to maximise what you have in the car, especially in the early races," Sutil said at the launch of the new Sauber C33.
"I would say fuel management would be the number one topic. That's something we haven't (had to) focused on so much in...
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