Fuel prices alone are unlikely to bring America to its senses. It clearly will take outright shortages with lines at the pumps, curtailed deliveries and many other misfortunes before serious measures to deal with declining oil supplies –- speed limits, rationing, mandatory car pools, improved mass transit -- are taken. Thus the question becomes: how soon?
Gasoline and diesel are two different animals in America. Most gasoline is used for personal travel and much of that for convenience and, as we shall find out shortly, is not essential to the economy. Diesel in America is, for the most part, an essential fuel in that it is used to perform money-making work or, in its heating oil form, keep us from freezing. If diesel becomes too expensive, and those expenses cannot be passed on, then the consumption of diesel will be cut back. This in fact is already happening -- the government is reporting that distillate consumption of diesel and heating oil currently is down by 3.1 percent as compared to the same four week period last year. This is undoubtedly due to the price of diesel and heating oil which is now around $4 a gallon, an increase of $1.17 a gallon since last year.
The word “distillates” encompasses both diesel and heating oil which are about the same thing; except that the clean air rules in the U.S. require most of the sulfur be removed before burning it in a motor. Currently there is a world-wide shortage of distillates which is most severe in China where long lines of trucks waiting for fuel are appearing across the country.
EDIT
U.S. imports of diesel appear to be dropping. For most of 2006 we were importing about 350,000 barrels a day. In the first quarter of 2007, we imported an average of 360,000 barrels a day but by last fall this had dropped to 260,000 barrels and was the same for the first quarter of 2008. This could of course turn around, but given growing demand and lack of an increased supply worldwide, it is likely that it will become harder and much more expensive to find diesel and heating oil to import.
EDIT
http://www.energybulletin.net/42610.html