I so envy all your 20+ mpg....I dont know why, I tried many times watching my mpg needle and still I can't get over 19mpg each tank. I dont want to go back to my stock 18's though, but maybe I should do it for a tank and see if that makes any difference (I changed to my 20's the first hour after I took delivery, never tested with the stock wheels).

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2010 BMW X5 35d Diesel (Current)
Prem/Tech/RB/RC/3rd row/ Black 20"s
2002 Porsche Carrera 4 cabriolet (Current)
H&R, 19" VIP Modular VR05
2007 530i Black Sapphire (Returned)
Steptronic/ Sport Pkg/ Premium Pkg/ NAV/ M Tech/ Black 20's