fuel efficiency

Carmaker Mitsubishi Motors says "improper conduct" resulted in 625,000 of its vehicles getting inflated gas mileage ratings, in a scandal that's centered on minicars made for Japan's market.

The cars in question are Mitsubishi's eK Wagon and eK Space, as well as the Nissan Dayz and Dayz Roox (which the industrial giant made for Nissan Motors). While the scandal seems to be limited to the Japanese domestic market, Mitsubishi says it is now investigating vehicles it made for overseas markets as well.

As the biodiesel industry convenes for a national conference in San Diego today, one of the topics of discussions will be the loosening of the renewable fuel standard.

Among the participants will be Seattle-based General Biodiesel, a company that turns used cooking oil into vehicle-grade fuel. The company 's CEO is upset over backpedaling by the federal government on incentives for more use of alternatives.

Mayor McGinn's photostream / flickr.com

When it comes to fuel efficiency, Northwest drivers are apparently motivated more by their wallets rather than a desire to be green.

A poll commissioned by Seattle based PEMCO Insurance finds 83 percent of drivers here save fuel mainly because they want to save money. Only 14 percent said they saved fuel primarily to cut down on pollution and carbon emissions.