I'll start a list for p'up drag coefficients and we can add and update as new data becomes available.The Cds will be in descending order, from high to low
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*1987 Ford F-150 ....................... Cd 0.567 (est)
*JEEP Comanche.......................... Cd 0.55
*1973-87 Chevrolet C-10............... Cd 0.569-0.535
*1985 Mazda B 2000 .................... Cd 0.523
*2002-2008 RAM 1500 Quad Cab .... Cd 0.52
*2000 RAM 4X4 1500 6.5' bed ........ Cd 0.50
*1986 Mazda B 2000 .................... Cd 0.495
*2001- Ranger ........................... Cd 0.49
*1994-2008 RAM 4X4 ................... Cd 0.48
*2000 RAM 4X4 Club Cab (all models)Cd 0.48
*1982-93 Chevrolet S-10............... Cd 0.475
*1982-93 GMC S-15 ....................... Cd 0.475
*1988 Ford F-150 ........................ Cd 0.473
*2005 Dakota Quad Cab 4X4/4X2 ... Cd 0.471
*2012 ISUZU D-MAX .................... Cd 0.47
*1987 Volkswagen Pickup .............. Cd 0.466 (est)
*2005 Dakota (all)......................... Cd 0.465
*1990 Volkswagen Tri Star Synchro.. Cd 0.46
*2000 RAM 1500 8' bed ................. Cd 0.46
*2000 RAM 3500 4X4 8' bed ........... Cd 0.46
*1988 Chevrolet C-1500 ................ Cd 0.45
*2000 RAM 3500 8' bed ................. Cd 0.45
*2004-2006 RAM SRT10 ................ Cd 0.45
*1994- Toyota T-100 ................... Cd 0.44
*1994-2008 RAM 2WD .................. Cd 0.44
*2006 Dodge RAM Mega Cab .......... Cd 0.44
*1990 Toyota pickup .................... Cd 0.44
*2000 RAM 4X2 Club Cab (all models)Cd 0.44
*2009 GMC Sierra HD .................... Cd 0.44
*1997 Dodge RAM 1500 ................. Cd 0.432
*1980s Dodge Rampage ................. Cd 0.428 (est)
*2008 F-150 Super Crew 5.5'bed ..... Cd 0.427
*1990 Volkswagen Projekt Zwo........ Cd 0.425
*1994 Chevrolet S-10 ................... Cd 0.42
*1994 GMC Sonoma ...................... Cd 0.42
*2009-12 Dodge RAM 1500 4X2 ...... Cd 0.419
*2011 Tacoma Pre-Runner off-road . Cd 0.419
*2011 Tacoma 4X4 0ff-road ........... Cd 0.419
*2009 GMC/Chev.XFE ................... Cd 0.412
*2009 F-150 Super Crew 5.5'.......... Cd 0.403
*2011- Ranger ............................. Cd 0.40 (A-pillars/C-pillars/lower air dam)
*2011 Tacoma Pre-Runner ............. Cd 0.394
*2011 Tacoma 4X4 ....................... Cd 0.394
*1997 Tacoma 4X4 V6 3.4L DLX ...... Cd 0.39
*2014 Toy.Tacoma (base) ............. Cd 0.39
*2010 RAM 1500 .......................... Cd 0.387 (200-hrs wind tunnel)
*2012 Dodge RAM 1500 4X2 ........... Cd 0.386
*2013 RAM 1500 Crew Cab SLT 4X4. Cd 0.376
*2009 Toy.Tundra ....................... Cd 0.37-0.38
*2007 Cadilac Escalade EXT .......... Cd 0.363
*1999-2004 Ford Lightning ............ Cd 0.36
*2010 Tacoma ............................ Cd 0.36
*2013 Dodge RAM 1500 4X2 ........... Cd 0.360 (lower dam,shutters,tonneau)
*2011 Tacoma 4X2 Reg Cab ........... Cd 0.357
*2011 Tacoma X-Runner ............... Cd 0.357
*1988 GMC Centaur (concept) ........ Cd 0.325 (est)
*2009 Mitsubishi Triton .................. Cd 0.32
*1989-90 GMC Syclone LSR ............ Cd 0.315
*2013 GM/Holden VT Commodore Ute, Cd 0.309
Here are two pictorial drag tables I completed last night.I'll add these as things evolve.