Can you install a modern VW diesel engine (ala Top Gear's "Project Sipster")? In a 550? Has anyone tried?
I'm aware of the many reasons NOT to do this, but is it POSSIBLE? A 1300 lb car + a motor that pulls 40MPGs in a 3000 lb Jetta has to be good for at least decent gas mileage, right? If a watercooled Sube WRX engine, will work, why not a diesel? Tom @ Thunder Ranch told me it could be done... with a little creativity in the motor mounts/half shafts dept.
I'm no mechanic so I reserve the right to be wrong about everything.
But if If anyone can, I'm hiring :-)