Most (and least) cost-effective hybrids

How much it costs to save a gallon of gas varies widely, even among closely-related vehicles.

Hybrid vs. diesel vs. flex-fuel Which will do the most for the environment, fuel supplies and your bank account. (more)
Hybrids: Seven worries, seven answers Sometimes buyers avoid hybrids for the wrong reasons. But, for some buyers, their worries are well founded. (more)
Top 10 best resale value cars Kelley Blue Book predicts how much these vehicles will hold their value. A CNNMoney exclusive. (more)