I bought my 2011 Optima EX Turbo in July '11 and am very pleased with its performance. Drove it from Cordova, TN to Granisle, BC, Canada and back and it gave us a wonderful trip, although the seats could use more cushion. The only thing I've noticed is that the fuel tank tops off at a maximum of 15-1/2 gals of gas in the 18.49 gal capacity fuel tank. This is with the "miles to empty" showing less than 30 - just over one gal remaining. Anybody have a similar experience and/or know why this is? Is there a reserve of about 3 gals? Or could my fuel level gauge be in need of adjustment?