How much will you be saving in amortization? A 2005 Escape will still cost you some 300k. If you're getting it for free, that's another story.

The Mirage should cost you roughly half-as-much to run per kilometer versus the Escape in terms of gas. Not to mention unscheduled servicing (for an Escape, that will be mostly brakes, busted lights, maybe the shocks after eight years). If you're paying roughly the same for both, I'd get the Mirage.