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Hucho has two references to lower CD from narrower tires.
Figure 4.117 on page 281 shows .31 for 195mm tires and .29 for 166mm on the same car
Figure 5.72 on page 295 shows a drop from .32 with 225/55/15 down to .29 for a 155 R 15
Those are some big CD changes.
Shows how GM's Volt Vs Prius CD comparison was set up in the Volt's favour by testing the Prius with 17" wheels instead of the base model's 15"
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