So I assume you plan your fill ups at a Chevron or Exxon - do they serve up straight diesel (no biodiesel)?
When you find a place with low prices, its probably an indicator of using mixed fuels.
Probably an old subject - is there a list of fuel distributors (a fuel station with a sign) that do/don't serve up biodiesel? On the gas side I think the fuel is mixed at the point where the distribution trucks pick it up. So I don't think it is the main manufacturers that make biodiesel (although a google search brings up Exxon right away).
I get bad enough mileage without the added loss of efficiency of biodiesel.
I can find who makes biodiesel, just not who mixes that in their diesel for retail.
https://www.farmprogress.com/biofuel...esel-producers
I fueled up at a WaWa yesterday and 1) I couldn't find a No Smoking warning nor a no cellphone warning anywhere, on any pump. ???
2) there was no stickers about adding biodiesel to the diesel, which my buddy contacted them and found out they do - seems that diesel should follow the gas ethanol warning requirement.