Malcolm - The A3 E-Tron technology and design is nearly 10 years old. At that time 2014 to 2018 this was good range and mileage for a PHEV.
If you compare it to a 2024 Niro you are not comparing similar engineering, battery Tech..
Compare your Niro to the Euro Only 2024 A3 E-Tron and you will see a better comparison.
Here are some specs for the 2024 Audi A3 e-tron sold in Europe: (No US A3 E-tron)
Electric range: The A3 e-tron has an all-electric range of up to 50 km (31.1 miles).
Top speed: The A3 e-tron has a top speed of 222 km/h (137.94 mph).
Acceleration: The A3 e-tron can go from 0 to 100 km/h (62.14 mph) in 7.6 seconds. Fuel consumption: The A3 e-tron consumes 1.5 liters of fuel per 100 km (156.81 US mpg). CO2 emissions: The A3 e-tron emits 35 grams of CO2 per km (56.33 g/mile). Power: The A3 e-tron has a system output of 150 kW (204 hp). Driving modes: The A3 e-tron can be driven in electric mode, combustion engine mode, or hybrid mode. Battery: The A3 e-tron has an 8.8 kWh battery pack.