2006–2007: Ford
For the 2006 season, Grönholm switched to the Ford team, driving their all-new 2006-specification Focus RS WRC. On his debut, in January, he won his first ever tarmac rally in Monte Carlo, beating Sébastien Loeb by over a minute, albeit beaten by the Frenchman on the road with the championship's unliked 'Superally' regulations coming to his rescue as a shunt for the Citroën hastened its exit from Leg One. Although he was to follow this up with an entirely credible win in the second event of the season, Sweden, subsequent events saw Loeb surge past into a comfortable lead: the Frenchman was to never finish below second place in every event he entered, while his adversary was left to rue a string of retirements and errors that stymied his challenge.
In the meantime, the hopeful Grönholm collected victories over Loeb in Greece and Finland. Loeb's hopes seemed to be coming to fruition when yet another victory in Cyprus brought him to the brink of the title; however he was to suffer his own blow days later when injury from a biking accident forced him out of the last four rounds of the series. Grönholm was able to push within one point of the lead in the total standings as Loeb recovered, but his claim to the title was finally extinguished when he rolled out of contention on the first leg of the penultimate event in Australia. Some solace for Grönholm, though, came in that another victory in New Zealand ahead of teammate Mikko Hirvonen was to confirm the manufacturers' title for his Ford team over Loeb-less Kronos Citroën.
The 2007 season started in good fashion for Grönholm. He claimed third place in the 75ème Rallye Automobile de Monte-Carlo behind the dominant returning works Citroens, and then the top spot in the Swedish Rally, mirroring the previous year's result. While the usually consummate Loeb tumbled out of the points from a potentially auspicious position in both Norway and Sardinia, Grönholm remained consistent and after winning for the 28th time in his career over the Citroen titan in Greece, led the championship by nine points over Loeb over the championship's summer break. At the 2007 Rally Finland, Ford secured a one-two with Grönholm taking the win and Hirvonen the second place ahead of Loeb. At the next rally, the 2007 Rallye Deutschland, Grönholm got distracted by a cow along the road and made a driving error while trying to secure a second place ahead of hard-charging François Duval, dropping him to fourth place behind his teammate.
Then came New Zealand, where after a tight battle over all three legs, Grönholm took a victory of historic slenderness over Loeb. The final winning margin between the two represented the closest ever in the history of the World Rally Championship: 0.3 seconds. This victory put him ten points clear in the championship with five rounds remaining. Podium finishes in Spain and France kept him on track for the championship, but after crashing out early at both Japan and Ireland the championship lead switched back to Loeb. Second place at Wales Rally GB was not enough to dislodge Loeb and so Grönholm finished the season as runner-up.
On 14 September 2007, Grönholm announced long-rumoured plans to retire from rallying at the end of the 2007 season, stating that "I wanted to stop while I still had the speed to win rallies. I didn't want to leave the decision too late so that I wasn't capable of winning any longer",[6] also citing the opportunity ahead of him to potentially retire as a three-time World Rally Champion.
