Maritime, the Passat engine isn't the VR6, but a different 2.8L borrow from Audi. And though most V6 engines are comparable, there are small differences.
I can't find the 300C's rating, but Magnum vs. Passat in automatics:
Magnum SXT (250hp): 12.2L/100kms / 8.1L/100kms
Magnum R/T (340hp): 13.8L/100kms (21mpg) / 8.8L/100kms (32mpg)
Passat TDI (134hp): 8.7 (32) / 5.7 (50)
Passat V6 (190hp) : 12.2L/100kms (23mpg) /8.0L/100kms (35mpg)
Passat V6 4MOTION (190hp): 12.7 (22) / 8.3 (34)
Passat W8 4MOTION (270hp): 13.4 (21) / 8.8 (32)
So while yes, the Passat V6's power isn't anywhere near the HEMI's it does get a 2 city and 3 highway mpg better, which isn't the same. The difference should be larger, and I think in real life, the difference may be. I couldn't say. I think more interesting is that the soon-to-be discontinued W8 in the Passat is dead-on comparable to the HEMI's efficiency with MDS. Again the HEMI has more power and would be more satisfying from that standpoint, but the weight of the two is pretty close despite the VW being smaller because the base car and AWD compensate so it's an interesting comparo.
I wasn't saying the HEMI is the biggest hog on gas comparatively, just saying that I don't like spending much on gas, no matter what I'm driving.
Anyhow, back to the Civic. Any updates?