The review must have been wrong. The ELR has (Bose) active nose cancellation (wish Tesla had this) and it is all but impossible to tell if the generator is off, running or what RPM. The active nose cancellation also lowers wind, tire and road noise. The ELR is MUCH quieter than my Model 3. Having to get used to a little more noise.....But then the reviews of what the actual engine sounded like when it came on. Yikes!...