It may not come as much of a surprise that the best selling model in the US is an SUV.  You may think $4.00 gas would dampen Americas love affair for the bigger is better rule, but in the case of a luxury nameplate like Porsche, gas mileage is usually of smaller importance. While I still believe that calling these cars SUV’s does them some form of disservice, the trend is in, and the nimble XUV’s are the new Tahoes and...