The company currently has plans to operate a fleet of six-wheeled delivery robots in Austin, Texas, delivering Uber Eats orders to customers, as well as South Korea. Now Avride’s next generation model is shedding a couple of wheels — and showing big gains in efficiency.

The new robot only has four wheels, which Avride says is more energy efficient than its six-wheeled model. The six-wheeled versions were simple to build, and could turn confidently on a variety of surfaces. But they also…