Multipliers
Perineum stuff and the 5 star bonus. Springfeild sign is a good one.
Forum Discussion
I actually read on an old thread on this site that the white picket fence would have the best % bonus for its price. I know you probably wouldn't want to do it, but say you spend 30 doughnuts on a vehicle, you would get less of a % bonus then if you bought 30 white picket fences.
