Propel Fuels provides Flex Fuel E85 and high-performance Diesel HPR at stations across California. The high-performance diesel seems to make a difference and tends to be slightly cheaper than regular diesel. While E-85 can be a little pricey compared to nearby places, the stations offer good hotdogs and $1 fountain drinks. The pumps are usually clear to get to. Propel's fuels aim to deliver better value, higher performance, and create healthier communities.