After following two posts on cooking french fries, I realized the take home lesson is: don't bother. As one commenter said, "The cold reality is that McDonalds has forgotten more about french fries than any of us will ever know."
So just spend two dollars.
(By the way, I was shocked at how inferior the fries were at a "French" "bistro" I went to for brunch the other day in Cobble Hill to Mickey D's. These things were a sodden, greasy mess, straight out of the fryer -- and at double the cost!)