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Less rotation mass is always a good thing when it comes to acceleration, braking, and MPG. You should see very mild gains in city driving, though highway is unlikely to offer much. I can tell a difference between my 15" light-weight aluminum wheels VS 14" steel wheels in terms of off-the-line acceleration with similar tires. Though, I had a friend who used 17" big ol heavy aluminum wheels (all show) and, as an experiment, swapped my wheels. He noticed a HUGE difference in the get-up-and-go!
Though, another thing to keep in mind: You can't simply "snap on" wheel covers on most aluminum wheels. My Rota Slipstreams are gonna take some real custom work to get them aerodynamically sound. There are a lot of easy snap-on options for steelies.
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