Diesel vehicle owners will soon be purchasing additional 250gal 'fuel oil' tanks used for oil-fired burners/furnaces... plumb them up in parallel in your basement and draw off it for the furnace and the diesel engines.
Oh yeah, I also found on the 'net a blue dye that will turn any diesel or fuel oil blue... what would the DoT say if they sampled your fuel and it was blue?
I'm not advocating such practices, but desperate times call for desperate measures.
Matt