Bullshit, unless you design your own diesel engines!! In fact, bio-diesel produces even more NOx than petroleum based diesel!!
"It turns out that diesel engines have an inherent trade-off between power, fuel efficiency and clean emissions, experts said.
"You have power, you have energy, you have emissions: You get to choose two of them," said Don Hillebrand, the director of energy systems research at Argonne National Laboratory in Illinois, and the former president of the Society for Automotive Engineers."
http://www.livescience.com/52284-volkswagen-scandal-clean-diesel-challenges.html
Sent from my Lenovo K52e78 using Tapatalk