Since our RV is based on Mercedes Sprinter with diesel engine, we are back to worrying about the fuel. Someone posted this very useful document from Mercedes on the issues involved with Biodiesel and what marking to look for on pumps. Pretty useful if you drive a diesel:
https://www.mbusa.com/vcm/MB/DigitalAssets/pdfmb/serviceandparts/biodiesel_Brochure5.pdf
https://www.mbusa.com/vcm/MB/DigitalAssets/pdfmb/serviceandparts/biodiesel_Brochure5.pdf