I heard that in the UK and Europe there are more cars that run on diesel. Right now, I think the only new car (not counting trucks, you can usually get a bigger pickup in diesel if you want here) that is usually offered as a diesel is the VW...like the TDI and Jetta, here in the US.
The reason I ask, is I am wondering how many of you that have diesel are or would consider using biodiesel, or using waste veggie oil, etc...so that you can cut your fuel expenses?