Unreasonably reference consumption on tesla and mercedes

When comparing vehicles for research( want to buy a new one) i use your vehicle data as a reference. In comparing “tesla model 3 lr rwd 2026” to mercedes cla 250+" to “mercedes cla 250+ shooting brake", the values are not plausible. The tesla model 3 is too efficient (131 Wh/km) while the cla shooting brake is MORE efficient then the “normal" cla. This doesnt make any sense. Other research information indicates that the model3 and cla should be on par and the shootingbrake a little bit worse. This makes me question all your vehicle data, where do you get it from?