biodiesel, more like bullshitdiesel

The United States has 434,164,946 acres of farmland, including grazing land,
Now, the United States consumes 230 billion gallons of oil a year,
so to use biodiesel, we would need to get 529.75 gallons out of every acre of farmland,
the problem is that the most efficient crop is Jatropha, which yields less than 200 gallons per acre, before processing costs. I am ignoring the theoretical 650 gallons per acre of palm trees because most parts of the country can not grow them. Not to mention the fact that even using some genetically engineered palm trees we would still be left with almost no land left to farm for...food, that other thing we need. So, anybody, cough, who tells you biodiesel is good for the environment is a liar, because it would kill off our most valueable resource for the future, soylent green.