Additive shortage means higher gas prices

Oil refiners are required to boost the oxygen content of summer-blend gasoline to make it burn more completely. Alkylate, a refining byproduct, is added to accomplish that, thus reducing pollution. But alkylate is in short supply and that could push average US pump prices to $4 a gallon. (Marcio Jose Sanchez/Associated Press)

NEW YORK - Get ready for another surge in gasoline prices.

Experts are predicting pump prices, which jumped almost a dollar a gallon in each of the last two springs in many parts of the United States, will spike again this year as refiners and gas stations switch from winter- to summer-blended fuels.

The increases, starting as early as next month in Southern California, could propel the average national price to a record $3.50 a gallon or more by June.

That would be 17 percent higher than the current average of just under $3 a gallon, which already is about 80 cents a gallon higher than year-ago levels thanks to the surge of crude oil that took futures prices briefly to $100 a barrel. Prices in urban areas on each coast could approach $4 a gallon.

And the reason for the spring price shocks? Analysts say it's linked to a shortage of alkylate, a little-known and expensive gasoline additive that some in the industry are calling "liquid gold." It has become a must-have ingredient since refiners stopped using MTBE two years ago when the potentially cancer-causing additive was found to be seeping into ground water.

The alkylate shortage has become the most important driver of summer gas prices, said Doug Leggate, an analyst at Citigroup Global Markets. "Supply of [alkylate] will set the price of summer gasoline - not inventory levels," he said.

Oil companies deny they are purposely limiting production of alkylate, which like gasoline, jet fuel, and asphalt is a byproduct of the refining process. But only recently have some started studying how they can boost output, and alkylate prices now are more than 15 percent higher than spot gasoline prices. That means overall costs will jump when it is added in larger quantities to summer-blend fuel.

Without additives, gasoline doesn't burn completely, increasing tailpipe air pollution. And untreated gas evaporates more quickly in hot weather, potentially causing vapor lock when it changes from a liquid to a gas and blocks fuel lines.

The federal government long ago required refiners to boost the oxygen content of summer-blend gasoline to make it burn more completely, a problem that was solved by adding MTBE and, more recently, ethanol.

But ethanol also has a high evaporation rate, so refiners increasingly have turned to alkylate, which Tom Kloza, publisher and chief oil analyst at the Oil Price Information Service in Wall, N.J., calls the "magic bullet" in making summer gasoline.

Alkylate and other gasoline additives don't raise the same safety issues as MTBE because they don't bond with water as effectively as MTBE did, analysts say.