Weigh it up!
Some say yes, some say no. It all depends on your specific operation as to weather or not you can justify the increased maintenance costs against the savings in fuel. In all aircraft that I have worked with (that would be more than I care to admit to) there is a certain amount of wear and tear induced by single engine taxi. I have seen everything from cracks in the nose wheel well to engine gear box changes, attributed to induced cyclonic vibs in the shut down engine. The airframe and engine manufacturers should be able to supply you with their single engine taxi experiences for a given airframe. Check with your rep and follow the manufacturers advise.