Is it better for the environment to buy a fuel efficient older car or a new hybrid?

What’s the better purchase in terms of short and long-term impact on the environment? A fuel-efficient used car like a Honda Civic (non-hybrid) or a new hybrid? The latter will have better fuel efficiency, but what about all the energy that goes into the manufacturing of the new car? I just feel like this push to buy more and newer things isn’t necessarily the answer to being a good environmental citizen, and I’m wondering what to do in this case. Thanks!