Do Nokian tires offer good fuel efficiency?

I'm curious to hear from others about the fuel efficiency of Nokian tires. As a long-time user of their products, I've always been impressed with their durability and performance in various driving conditions. However, I've noticed that they tend to be on the heavier side, which might affect gas mileage. Does anyone have experience with Nokian tires in terms of fuel efficiency? Do they live up to their eco-friendly reputation? Have you experienced any notable improvements or declines in your vehicle's MPG since switching to Nokians?