I know it looks bad, that front edge, but the money is always at the back. Always.
Nothing will do as much as a 6' long folding 3 piece (top and sides) boat tail with straight panels.
Go back and look at all the figures and data, and look at the NASA van with an absolutely flat front. The tail knocked the CD down more than anything, by a huge margin.
It is not that hard to do either, and can be built to fold away for parking or whatever.
Example:
http://ecomodder.com/forum/showthrea....html#post9902
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears