As I see it, if you are willing to drive a compact vehicle with marginal performance, you can find that now without the premium price of a Hybrid.
If you require room and more performance, going from a vehicle that gets 18 mpg to one that gets 36 mpg, and still meets your needs (like the FEH). makes sense.
I expect payback within 5 years, and relatively low depreciation if I decide to sell it before that time.
If you are going from a vehicle that can achieve 40 mpg to one that may achieve 50 mpg - the payback may never come - especially if you pay over MSRP.