With two long time trials on stages nine (41.5 km) and 19 (53.5 km), the BMC team leader is set to face a formidable challenge from on-form Briton Bradley Wiggins of Team Sky.
Wiggins, a fourth place finisher in 2009, rebounded in style from his early exit last year when he suffered a broken collarbone by posting a series of impressive results in major stage races.
Evans, has had a less successful season but the Australian said he has not been resting on his laurels.
“I’ve had a bit of a quiet start to the 2012 season, but that’s okay,” said Evans.
And the Australian has put the satisfaction of last year’s triumph to the back of his mind.
“It’s still satisfying to think that we did it in 2011. We are looking to ultimately repeat in 2012,” he said.
“We’ve come here with a stronger team and, having done it once, we know we can do it so I think we come here more confident and most of all we’re well prepared,” he added.