What is the best engine to use for fuel economy in a Vauxhall Astra?

I'm trying to decide which engine option would be the most fuel efficient for a Vauxhall Astra. Can someone give me some advice based on their personal experience?

The best engine for fuel economy in a Vauxhall Astra is the 1.6 CDTi diesel engine. It offers great fuel efficiency and has low CO2 emissions. I would definitely recommend it.

I've found that the 1.0 Turbo petrol engine is also a great option for fuel economy. It may not have as good MPG as the diesel engine, but it's still very efficient and offers a smooth driving experience.

I've heard good things about the 1.6 Turbo D ecoTEC engine as well. It's a newer option and has been designed to be more fuel efficient. It's definitely worth considering.