Those questions are hard to answer.
1. Good fuel consumption based on what? Engine power? Helicopter weight? Speed? Range?
For example, AW101 burns ~3.5 l/km. AS 350 burns ~1 l/km. But 101 carries a hell of a lot more payload.
2. see above.
3. IDK and can't be bothered to google it, so I'll go with one that is shut down.