I saw this photo this morning on top of the gas pump as I was filling up. If you can arrange a hybrid vehicle they’re definitely the way to go. Gas in California isn’t as high as it was a few months ago but it’s still tops in the nation. So ask for a hybrid when you rent a car.
Online I was only able to find hybrids at Avis. If you work for one of the other companies and you have hybrids please send me a link.