I've got a similar plan. Starting with a 1.6TD and throwing it into a 1990 civic hatchback. I have both cars, I'm just saving up to so that I can get the swap done in one quick change. A similar project was done with a 1.6 into a crx... Unfortunately the thread died but he did get it installed.
VWvortex Forums: 1985 vw diesel swap into honda crx
I figure that if basjoos can get 70 mpg's out of a similar car that was epa rated at 49 with a less efficient engine I should be getting some nice numbers right off. And then add in some extreme aero modding and you have one high millage machine