One thing to keep in mind about the reported drag coefficients,is the velocity and Reynolds number in which they were measured. Driving speed for the Solar GT was around 35-mph,which might have it in a sub-critical Rn to take advantage of laminar boundary layer (cheating if true!)
Both the Cruiser,and it's offspring,the Solar GT both share Luigi Colani's inverted airfoil 'diffuser.'
Here's the Solar GT
Both cars have good sectional density.The roof is a bit fast,but it's a solar car and this might be a concession to solar insolation.
Some comparisons would be the 1981 Buchheim et al 'Flow' body,Cd 0.14
The 1993 GM EV1 LSR record car,Cd 0.14
The 1985 Ford Probe-V concept,Cd 0.134
The 1987 GM Sunraycer,Cd 0.089-0.141
The 1922 Paul Jaray 'pumpkin seed,Cd 0.13
The 1957 MG EX 181 LSR,Cd 0.12
!993 Honda Dream 2,Cd 0.10
2013 Cambridge University CUER,Cd 0.10
