I was looking at the Saturn Aura Hybrid and the Saturn Vue Hybrid. They both get the SAME EPA mileage ratings of 24 city/32 highway. Same engine and trans, yet the Aura weighs 260 pounds less (3529 lbs vs 3789 lbs) and has a better Cd (0.26 vs 0.36).
I would expect SOME difference, wouldn't you?