it really does smell good. i have a buddy with a benz turbodiesel wagon that runs straight wvo. he has a tank, filters, a heat exchanger and a switchover solenoid for when the vehicle heats up.
one day i was on 390 south of rochester and i was like " i smell fries??? wtf??" and when i got a little further ahead, there was the wagon, cruising down the road. 
even biodiesel smells better than diesel. the meth gives it a little zip but it isnt bad. i do the fire alarm inspection at the salt mine in mt morris and they run biodiesel in all the vehicles in the mine itself. we were buzzing around on a kawasaki mule down in the mine and it didnt smell bad at all. they have all kinds of crap down there and all of its diesel. full size trucks, loaders, little buggies like the mule etc.
Brian
Brian