Governor Accepts Donated Dodge Pickup Powered by Syntroleum's Ultra-Clean Fuel; Discusses Continued Commitment to Alternative Energy

HELENA, Montana--June 19, 2006--Governor Brian Schweitzer and First Lady Nancy Schweitzer today filled up the tank on a Dodge pickup with ultra-clean diesel developed through a gas-to-liquids process using proprietary Fischer-Tropsch technology owned by Tulsa, Okla.-based Syntroleum.

The Dodge Ram pickup donated by Dodge dealerships across Montana operates on synthetic diesel made from natural gas or coal.

"I would like to thank Syntroleum and Montana Dodge dealerships for their generosity," said Governor Schweitzer. "This is a great opportunity to showcase the ultra-clean and abundant energy possibilities available today. Our nation is too dependent on foreign energy. The United States currently imports about 60 percent of its crude oil and refined product requirements. It doesn't have to be this way."

"We are pleased to assist Governor Brian Schweitzer in his visionary efforts to bring attention to Fischer-Tropsch opportunities in the United States. Much like the gas-to-liquids process, we believe we can produce ultra-clean fuels from coal using our Fischer-Tropsch technology," said Jack Holmes, president and CEO of Syntroleum. "We fully expect the diesel being used to operate the governor's vehicle will validate the ultra-clean characteristics of Fischer-Tropsch fuels, which have no detectable sulfur or aromatics, are biodegradable and have a high cetane number. Additionally, unlike some alternative fuels, Syntroleum's diesel is 100 percent compatible with current and future diesel engines and can be used as a blending agent."

Syntroleum will be providing up to 3,000 gallons of S-2 synthetic diesel fuel to the State of Montana. The test vehicle is a Dodge Ram 2500 truck powered by a Cummins diesel engine. The demonstration program will look at the fuel efficiency of S-2 and the impact on engine operation and driver perception of the fuel.

The governor and staff will keep careful records of gas mileage and maintenance and the results will be regularly returned to Daimler Chrysler and Syntroleum for their research.

There are many benefits to synthetic fuels, which are economical to make and have virtually no aromatics, no sulfur and are non-toxic and biodegradable.

About Syntroleum

Syntroleum Corporation owns a proprietary process for converting natural gas or synthesis gas derived from coal and other carbon-based feedstock into synthetic liquid hydrocarbons. The company plans to use its technology to develop and participate in natural gas and coal monetization projects in a number of global locations.

(R) "Syntroleum" is registered as a trademark and service mark in the U.S. Patent and Trademark Office