According to OEWheelsllc.com, when I spoke to them on the phone they said the 17x9.5 and 17x11 weigh just about the same, 25 lbs each. I asked how that is possible when one is 1.5" wider, and he said thats just the way it is. Okey Doky....
Anyway, OEWheels sells the rims with sumitomo tires, and according to sumitomo literature (regardless of whether or not you like them) their tires weigh 30.8 lbs for the 275, and 33 lbs for the 315. So even the heaviest wheel tire combo is 58 lbs, vs 51.3 for the factory 17 setup. Thats 6.7 lbs more than factory for 315's.
Doesn't sound like a lot, does it? I wonder if OEwheels is giving accurate info....
If you say you felt a difference, I believe you.
And yeah, salad shooters are probably the lightest, but they are also the least desirable appearance wise.