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Use of var keyword in C#

I have ReSharper, which is a pretty good tool to remind me of some good programming practices..

for example it always recommends that I use the most narrowed convention I can use when passing variables to functions (such as recommending IEnumerable instead of List when I fail to use any of List's specific function.

Awesome.

However, one of its new behaviors (for C# 4.0) is to remind me at every opportunity to use 'var' when declaring variables.

Now I know that there are some valid uses of 'var', but do I really want to use it all the time?

I'm sure that ReSharper has a reason for this, but I can't figure it out.. for me it makes the code less readable..