In 1998 I bought my "last new car," a '98 VW "new beetle" diesel TDI. Throughout its first 250000 miles I delighted in its speed and efficiency. I was pleased with 46-50 mpg and its occasional 700 miles on a tank of fuel. In the last month, I have noticed a drop in mpg and thought "it must be the wind" or "I need a tuneup." Yesterday I drove to NE Colo to watch DD play in a volleyball tournament. I needed to fuel up before I had driven even 500 miles. I have been seeing notices on diesel pumps about a low sulfur diesel reformulation. I have also learned that VW will not be making a 2007 (American bound) diesel because of the reformulated low sulfur diesel gas required in the US. The "no 2007 VW" policy is merely a "suspension" while VW re-designs its engine to make it compatible with US fuels. My question: Is my 20% decrease in mileage attributable to the reformulated low sulfur diesel fuel? Can the old diesel still be obtained for "the old" diesel vehicles? Finally was I premature in buying my "last new car?"