Ever wonder where Holme Grown Brand California Ecotourism gets it's biodiesel fuel? Well, we source it all from a chain of Bay Area gas stations called "Rotten Robbie." The particular station we use is on Guerneville Road in Santa Rosa.

Tom Robinson, president of Rotten Robbie, said the choice to start offering B20 biodiesel, a blend of 20 percent biodiesel and 80 percent petroleum-based diesel fuel, was out of environmental concern and to provide another option to customers.

"As a private brander, we want to be able to provide as many options to the consumer as possible to maintain a competitive market," Robinson said. "This is a bit of an experiment to see whether there is a market for B20 and whether it can become a viable alternative fuel option."