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I'm being pedantic here, especially since we all know when someone says "alloy" they are referring to aluminum wheels. Steel is an alloy though, the difference is that steel implies an alloy (mixture of metals), whereas aluminum does not (aluminum is an element).
To the topic at hand, I compare wheel weights on Tirerack.com
Finding compatible wheels can be tricky and I usually visit a forum specific to the type of vehicle to see what wheels others are running. Wheels are tricky to fit because they have to be the right diameter, width, offset, and bolt pattern.
I wouldn't expect lighter wheels to have measurable fuel savings. Mostly the benefit will be felt in quicker acceleration and better ride.
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