Nothing says "I Hate America" more than 1. Wasting fuel and 2. Polluting the nation's air. These morons are rebels without a clue.
Making biodiesel from oils is awesome and then powering your vehicle with them is again awesome. Finding said oils is not always that easy. So much oil ends up being dumped by restaurants because they don't know who wants it or how to get it to them. A new auction wesite will link buyers of recyclable oils with those trying to dispose of them.
So you're doing the right thing for the environment and your health by commuting on a bicycle but unfortunately you're breathing in tens of millions of exhaust nanoparticles.