Just because you don't actually give a toss about driving, doesn't mean the rest of us do.....
Face it, you've given up on driving pleasure for the Saab, which is typically 'safe' for a number cruncher.
'LPG' isn't a valid suggestion. Ticking the 320d box might be. Picking something that's within the guidelines, but not within the spirit, but significantly more interesting than any of your euroboxes is probably the way forward, and a f*ck load more interesting than the placebo effect of the difference between 95 and 98 RON fuel with a LPT lump.