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There was a fellow named CRXGator on InsightCentral who "upgraded" from the 11lb Insight wheels to wider, 9.5lb wheels. He also replaced the 13lb OE tires with 20lb units. So he replaced 96lbs of rotating mass with 118lbs that has more of the mass farther from the axis of rotation - a BIG step in the wrong direction.
He also moved from a wheel that has a good selection of summer and winter LRR available, to one that has almost nothing but grippy, high rolling resistance summer tires.
Wider tires have everything to do with conformity, and nothing to do with fuel economy.
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