Diesel engine swaps

Yeah, I think my wife managed to get 35mpg out of the 1.8T
I never could stay out of boost long enough to break 25mpg

I'm not sure I would consider a diesel engine cool (I always considered them a farm emplement) but I ain't funding this project either

So, if you want to do it, I do think the VW diesels would make a good candidate, both with availability, dependability and aftermarket support