The surprise is the short version of the trailer wich yesterday achieved cd=0.201, if i could build a trailer extension of my "future" van with that shape I could do the same work but above de 42 mpg when full loaded with the standar gearings. Oh my god! I need to win one jackpot and start building a prototype. Why we changed the fleet some months ago? Why? Double mpg instead some percentatge increase (+13 to +25% mpg) we achieved could be done if we thinked a żlittle? before. I was focused on little driving tips, speeds, aeromods (and axle ratio) changes instead of thinking we could go far away from the make.
If you are a big enterprise like UPS its easier to R+D:
UPS Testing High-MPG Composite Vans (video) they design their own vans using aluminium, diesel, custom body, and now composites.