Even if there were "defaults" on hybrid loans, it wouldn't be noticeable since cars with high resale value (like hybrids) don't get "upside down" on the financing where the owner owes more on the load than the car is worth.

I bought my FEH on low interest 100% financing - I put no money down and sold my old car for cash. Why spend my money when someone else provides it (almost) free?