This should be simple, to start off you are looking at the wrong end with the photo posted.
Look to the rear first, that is where drag comes from.
I would think a simple boattail Dryden/NASA style would do a lot.
I also recently posted a VW van with a fabric tail which looked promising.
Please post some side elevations and rear 3/4 views to stimulate suggestions.
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George
Architect, Artist and Designer of Objects
2012 Infiniti G37X Coupe
1977 Porsche 911s Targa
1998 Chevy S-10 Pick-Up truck
1989 Scat II HP Hovercraft
You cannot sell aerodynamics in a can............
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