www.wheelweights.net
You will find all the lightweight wheels.
I just got Polished Centerline storm's 17x7 @ 11.8lbs ea. (The lightest 17") and 205/45/17 tires that are 18lbs.
Also another thing I got is Magnsisum/Alumnium Lug Nuts. They are 25G vs 60G for the stock lug nuts, does not seem like much, BUT multiply that by 4 per wheel, it adds up to over an 1lb for the car.
It all adds up. Ill see If I get any more FE, but its more of a looks thing. As long as it does not go down from the mid 40's Im getting now im happy. (FL heat, AC on ALL the time, Short trips, im happy with the 44-48mpg im getting)
The Cars
2005 HCH CVT
17" wheels, HID Lights. getting in the high 40's mpg.
2004 Mustang Mystic Cobra
650hp + Heavy foot = 10.4mpg
2003 Harley F-150
6000lb + Supercharger = 14.7mpg
2002 Trans Am WS6
Stock 22-25mpg
1996 Lincoln Mark VIII
800hp + 4400lbs = bad FE