How can I maximize the lifetime of my cleats I'm using look kéo cleats. My right one is much more worn down than the left one. Almost to the point where I don't think it will have any edge showing on the front lip. 

I do walk in them a bit, but usually in grass or on smooth tile. In both conditions I would think it's the heel hitting the floor more, so the front wearing quicker is a surprise to me.

What are some causes of early wearing on cleats and how can I prevent them?
You can get special covers for your cleats that make it easier to walk and extend their useful life.

http://www.amazon.com/gp/aw/d/B000UDBLQO