How do biodiesel’s miles per gallon compare to the miles per gallon (mpg) of regular diesel?
It will drop about 8 percent with 100% biodiesel. The reduction will be less with the blends in more or less proportion to the percentage of biodiesel. Biodiesel has 12 percent less energy per pound but since it has a higher density than diesel fuel, it has 8 percent less energy per gallon. We should expect the combination of reduced power and increased fuel consumption to be approximately that level. Many people report that they do not see a difference with B20 but their tests are not usually very precise.
