The team's revamped W15 aims to position itself as a strong contender in the upcoming season.
“It's impossible at this time of year to be anything other than apprehensive, coupled with excited, coupled with frightened," Allison told Motorsport.com.
“Those are always the emotions that you feel, and I would imagine that even in Red Bull, after a year of such good performance, they will not be sleeping easy in their beds either because no one knows what everyone else will deliver.
“However, what we do have some hope for is that some of the more spiteful characteristics of the rear end of our car will be a bit more friendly to us, and the handling of the car a happier thing.
“That's all in simulation, but nevertheless we’ve got reasonable grounds to believe that we've made some gain there.”
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