Di Resta and Grosjean positive

Force India's Paul Di Resta and Lotus driver Romain Grosjean react to their first day of testing in Barcelona, with Scotland's Di Resta stating his team are "on an upward slope".

Grosjean set the fastest time on day one at the Circuit de Catalunya ahead of McLaren's Jenson Button, but the French-Swiss driver admits there was "not 150 kilos of fuel in the car", hinting he may have been able to go quickly due to a light fuel load.

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