in addition to the need to accelarate immediately on ocassion,fuel consumption difference(depending of course on the way the car is being handled),you can also jump start that cat without jacking your battery...and even without the jumper cables *stua* I know you can on an auto but it by and large messes it up... it was NOT built to perform on stua mode...
and in other related news... a 1999 premio,manual??? 490k??? no way jose!! thats a pretty penny!
if you can not be kind,at least have the decency to be vague
speak softly and carry a big stick, you will go far... Theodore Roosevelt