[bikeprof]

As you know, the trailer is 8O% of the combination. LOTS of damage to the air is created by the tail end, so..., if we were to improve the tail end and create flowing instead of waterfalling, then the FUEL(in this case, FUEL/Diesel) economy would be GREAT!

I'm not going into description but many items can be done to improve the air CHAOS out of the back end.

I drove a truck,(owned few trucks), and I would try to keep the Diesel MPG's at about 7.57+(real figures) to an all time high(3 trips loaded), at 9.40 !
Mind you, '00 Freightliner Century/500 Cummins/10SP & 48' Flatbed spread, net combination lbs: 32,000+/- ~78,500 loaded
Without any MODS 'cept the nut behind the wheel.
Good stuff can come out of want and some technology :-)))))