Back in 1984, Craig Henderson and Bill Green built a one-of-a-kind super fuel-efficient car called the Avion. In 1986, it set the Guinness world record for fuel economy by averaging 103.7USmpg (2 ...

Jeff Glucker May 9, 2016 Comment Now! When you open your fuel filler door, you may miss that bright green letter D staring you in the face. That D stands for diesel, and it's what your engine craves.