Romain Grosjean feels he is producing his best driving performances of his career this season after finding a set-up he's happy with both in and out of the car.

The Lotus F1 driver claimed another healthy points haul with a strong seventh place in Japan to leapfrog Sergio Perez in the drivers' standings into ninth. Grosjean currently heads the tight mid-pack battle in the F1 championship between the Lotus, Force India and Toro Rosso cars.

After consistently outperforming his team-mate Pastor Maldonado and claiming his team's first rostrum finish in two years at Spa in August, Grosjean believes working on his mental approach to F1 as well as car improvements have enabled him to produce his best performances of his career.

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"It probably does, it's a lot of work," Grosjean said. "It's not a secret that I worked with a psychologist and dealing with all of that is what we do as well. I'm probably driving better than I've ever done; qualifying performances have been outstanding this year and I'm very happy with the way we set-up the car and the way we go in the weekends."

Despite Lotus being threatened with administration and cash flow problems now hitting the team's track operations at Suzuka where the team was locked out of its garage on Thursday as well as having no hospitality facilities, Grosjean has been able to put these distractions out of his mind to fully focus on racing.

Grosjean is also heavily linked with a move to new team Haas F1 for 2016 which would bring an end to his seven-year affiliation with the Enstone-based squad.

"So all of that driving improvement helps me just to forget that we have to stand up and get changed in the garage, but it's not the end of the world." He smiled. "It reminds me of Formula Renault winter testing in the two litres, it's actually good fun. It is, like I was 18 again. "It's good, I've lost ten years in one weekend!"