I don't dispute that you can save weight by fitting +1 or +2 forged alloys vs steelies. Forged being the key word. For any affordable OEM or aftermarket alloy, the smaller steel rim/tyre will be lighter. A lot of people make the assumption that since alloy is lighter than steel, an alloy wheel must be lighter.
Quote:
OE Pop Steel Wheels/Tires/Hubcaps - 31.6 lbs (126.4 lbs set)
OE Abarth 16" wheel, OE Pirelli Tire with TPMS - 37.6 lbs (150.4 lbs set)
Rota Shakotan Wheels / OE Tires with TPMS - 29.9 lbs (119.6 lbs set)
Shakotan Wheels - 13.7 lbs (51.8 lbs set)
Pop Wheel (no tpms) - 14.4 lbs (57.6 lbs set)
Pop Wheel/ Hubacp - 15.8 lbs (63.2 lbs set)
17" OEM Abarth Wheels (no tire, Hyper Black or White rim with center cap) 20 lbs each
17" OEM Abarth Wheels with P-Zeros 38.8 lbs each
16" 500T/Sport wheels and 195/45-16 P7 all season tires: 36.9 lbs (147.6 lbs / set)
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From:
2012 Fiat 500 Parts Weight Compilation
The aftermarket Rota wheels are the lightest, but it's only the tiniest bit lighter than steelies without hubcaps. All the OE +1 and +2 options are significantly heavier.