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If Armstrong feels any pangs of nostalgia or regret that this portion of his career is ending, he is unlikely to reveal them. His public persona as the final curtain prepares to fall is warmer than in the past but still controlled.
The seven-time Tour de France winner said before this farewell race began that he expected to feel no particular emotions when this substantial part of his career draws to a close. He will climb off his bike at the end of the 90km street circuit in downtown Adelaide and, he says, he will walk away, perhaps a little more sore and weary at 39 than as a young man, but without remorse.
He enters an uncertain future. Exactly how his life and career will pan out from here is not yet decided: he has hinted at a return to triathlons and mountain biking events, which were his first love before he became the world's most celebrated road cycling.
And the questions that have dogged his career remain as a vague shadow even over this farewell. He has never tested positive to a banned substance, but even in the past week as he rode the undulating roads of South Australia state, a report in Sports Illustrated examined allegations new and old of his connection with doping.
He has refused to discuss those reports, though via his Twitter feed, on which he heavily relies to communicate with fans, he tweeted Friday that he expected to be vindicated when the US anti-doping agency studied the substance of the Sports Illustrated report.
Armstrong takes some solace that his popularity with fans - many of whom have been inspired by his recovery from testicular cancer and others who admire his dedicated efforts to support the fight against that disease -is largely unmoved by rumor or speculation.
He calls it the Starbucks Index, the difference between the public's reaction to him and the efforts of others in the media or within cycling to connect his achievements with the taint of doping. Armstrong says that if he's standing in line at Starbucks it's unlikely the person next in line will confront him and call him a drug cheat, rather will shake his hand and seek his autograph.
And he knows his fans.
In Australia, on his third visit in three years, he remains immensely popular and respected.
Fans clamor for his signature at the start and finish lines of every stage and line the race route with signs thanking him for competing in the race and wishing him success.
Armstrong responds to that support and fans find him relaxed, accessible and courteous.
"Really hats off to them," Armstrong said of the Australian spectators after competing in the fifth stage of the Tour Down Under on Saturday, ending in the rural township of Willunga.
"I think it's good to have top level pros here and top level racing, but it's really the fans, I think, that make this difference.
"You see at Willunga and you see on the climbs how many people there are and how enthusiastic they are, not just for myself, but for everybody. It's a great atmosphere."
More than 100 000 will watch the last stage of Armstrong's last race on Sunday and likely most will wish him well. His wife and young son will await him at the finish and soon after he will fly to Brisbane for a charity ride expected to raise more than half a million dollars for victims of floods in Queensland state.
