We couldn't pass up mention of the winner of last week's Eco-marathon Americas, a fuel-economy challenge sponsored by Shell Oil Co. A team from Cal Poly San Luis Obispo won the $10,000 grand prize by achieving the equivalent of 1,902.7 miles per gallon on regular gasoline in a student-built vehicle. Granted, the students didn't win in someone's mom's Dodge minivan. Their car" is a one-occupant streamliner built of carbon fiber composite. At a measly 98 pounds, it weighed less than the driver. And that was 98 pounds including the car's 50-cubic-centimeter Honda engine. "The main reason we do this is because it's a way to encourage students to focus on technical innovation for potential future careers," said David Sexton, president of Shell Oil Products. But there is a practical side to the competition, said Cal Poly team manager Tom Heckel, a junior mechanical engineering major. "Any publicity we can get makes people aware that the 20 mpg or so they're averaging in their cars can be improved on - a lot." The event, held April 14 at the California Speedway in Fontana, was the first time that Shell had brought its 25-year-old Eco-marathon competition to the U.S. The event drew 20 university, college and high school teams from around the U.S. and Canada. Rules called for each vehicle to complete seven 1.45-mile laps around the speedway's inner track, averaging at least 15 mph. Fuel consumption was measured after each attempt and adjusted for ambient temperature and other factors in a complex formula that ends up giving an extrapolation of miles per gallon.