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Depending on your driving conditions it won't add up to much improvement. Acceleration can be improved for stop and go driving. On the highway at steady speed there isn't much difference. The general trend from automakers has been towards aerodynamics rather than weight. I've cited Honda many times on this issue. The VX and HX of the 1990's were equipped with super light wheels. As you moved into the 2000's the first gen Insight and Civic Hybrid had more aerodynamic wheels instead of focusing on just weight. There are a lot of threads on Ecomodder about MPG improvements from wheel covers.
The ideal solution would be a lightweight wheel with a wheel cover. But if you have to spend a significant amount of $$$ on the light wheels, it would take a long time to return any savings vs. just adding wheel covers to your steel wheels.
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