Its best to get it tuned so it only uses what it needs. When you say rich, it usually means its using in excess of fuel that it should be, therefore its a waste.
That being said, rich is better than lean any day! You would rather it be running rich with a little extra fuel, then running lean and do some damage.
The best posssible thing you could do is get it tuned, that will give you the most gains/improvement in performance and also fuel economy.
Bit of extra information in regards to tuning, for your own use:
For R32 ECU you can get a REMAP, which they re-tune the standard ECU, or just got a full stand-alone ECU (Apexi PFC, WOLF, Microtech, Autronia etc..).
Most use a REMAP, and some use a SAFC II, there both fairly cost effective.
Personally, I will be using an SAFC II, which is a piggy back fuel only computer. That will serve my purpose, and has the compacity to run 2x fuel maps.
Thanks,
Abu