Heppner, 37, leads Italy's Francesco Casagrande by nearly three minutes with eight stages left.
He went into the final day with a comfortable lead after winning all eight stages on Saturday.
He came into the Tour as the favorite to claim the green points jersey, having won five of the eight stages of this year's Tour of California and shown his versatility in other races.
The course, which includes six summit finishes in eight mountain stages, is expected to favour the climbers and could be decided on the penultimate stage, atop the 2, 250-metre Bola del Mundo.
She's done plenty of theater -- in fact, eight years of plays on stages in New York.
There are eight new chemical entities in various stages of development that have generated four investigational new drug applications with the FDA. Since the payoff from these projects is far in the future, Ranbaxy's labs will continue pumping out generics, which net the company an aftertax margin of 16%.
APOEL's unlikely run continued in the round of 16 with a dramatic penalty shootout victory over former French champions Lyon -- who had reached the knockout stages in each of the previous eight seasons.
Attorney General Alberto Gonzales was directly involved in various stages of the process of firing eight U.S. attorneys, contrary to what Gonzales has publicly said, his former top aide told the Senate Judiciary Committee on Thursday.
Loeb dominated proceedings once Gronholm had bowed out on stage eight, winning four of the day's six stages.
BBC: Marcus Gronholm had won four of the six stages on day one
There was huge criticism of the protracted 2007 World Cup in the Caribbean where group stages were followed by a round-robin Super Eight phase before the two semi-finals, and the tournament comprised 51 matches in total.
The eight group winners plus the runners-up go through to the knockout stages of the competition, while the teams finishing third go into the Europa League.
Each is, appropriately, adorned with a four-claw dragon on the battery cover, and the engraving process is rather lengthy: it involves 20 stages and takes four highly-skilled master craftsmen 36 hours, eight of which are dedicated just to the dragon's scales.
ENGADGET: Vertu rings in the Year of the Dragon by welcoming a trio of Signature luxury phones
Over the years, the Stranahans have expanded in stages, adding space gradually as a growing homestead might, with the total now eight cottages and six rooms in the lodge, all different and with different views.
There were eight worlds, with four levels each, which meant that you had to pass through thirty-two stages to get to the princess.
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