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I think a non-o-ring chain is a good idea if you are looking for max MPG, especially with a small engine.
You can see the difference when you compare the spinning resistance of the two. It's noticeable.
In dirty or wet conditions the non-o-ring chain is going to deteriorate much quicker than an o-ring, but in normal conditions on a small bike it should last quite a while if lubed frequently.
We have mid-priced non-o-ring chains on our dirt bikes (CRFs) and they have done pretty well in mostly sandy conditions, but we do run them in the snow as well.
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