He's also appealing to many fans because he seems to be just like them--the guy next door who just happens to double as the best driver on the Nascar circuit.
For the time being, team managers will choose to use it depending on the type of circuit and the driver's girth.
Mr De Tomaso had started out as a racing driver, a star in the circuit of Buenos Aires, where he was born.
ECONOMIST: Alejandro De Tomaso, car maker, died on May 21st, aged 74
But a rule change, announced on Friday, will allow one day of testing at a non-F1 circuit if the substitute driver has not raced in F1 for two seasons.
The new layout was met with a generally positive response from those at the circuit including Red Bull driver Mark Webber and his former team-mate, now a BBC pundit, David Coulthard.
Meanwhile, Indian F1 driver Narain Karthikeyan told the BBC that the circuit was "looking amazing" and that the problems caused by stray dogs had been over-exaggerated.
The automaker says that the driver door could be corroded by liquids, cause a short circuit and power door locks and window switches could malfunction.
He will replace regular driver Karun Chandhok in Friday's first practice session at the Circuit de Catalunya.
The Ferrari driver, who says he "grew up" at the Interlagos circuit, won his home race in 2006 and was second to Raikkonen last year after letting him pass.
Button completed a race simulation at the Circuit de Catalunya on Saturday at the same time as Ferrari driver Felipe Massa.
His best of one minute 22.716 seconds was half a second quicker than McLaren driver Jenson Button, who had set the best time in the morning at the Catalunya circuit in wet conditions.
The DCRC greatly decreases standby power in the retention circuit by periodically activating itself to update the size of the buffer of the retention driver.
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The Englishman was battling with Massa's team-mate Kimi Raikkonen at the Spa circuit when he cut the Bus Stop chicane, resulting in him overtaking the Finnish driver.
The McLaren driver needed only to finish inside the top five at the Brazilian Grand Prix in Sao Paulo's Interlagos circuit to claim the crown, but it happened in the most dramatic of circumstances.
Test driver Pedro de la Rosa will give the McLaren its debut in a private test at Portugal's Algarve circuit on Saturday - the first of a series of critical tests before the start of the new season in Melbourne, Australia on 29 March.
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