It must be the case that the official government numbers for mpg are based on tests when the eco-mode is off.
matching, beating, and exceeding the EPA numbers are pretty simple...if you drive according to the posted speed limits, but then again who does? I and traffic itself tends to want to go at least 10 over the speed limit; however, I'm happy that I'm still getting mid 40s on highways and mid 50s in town congrats on your mpg =D
It may, indeed, be the case. I do not care for the eco-mode most of the time. It makes the car feel more sluggish. The car can get anywhere between high 30's to well over 100 mpg, depending on how it is driven and a myriad of other factors including ambient temperature, tire pressure, A/C or heater usage. A look at the 'c' in fuelly.com's records shows that the average mpg's are pretty close to EPA numbers. Toyota Prius C Mileage | Fuelly
It must be nothing'. You're doing good because you're doing good. People routinely beat the rated mileage. The displayed mileage beats the actual, calculated mileage. In the main all ECO does is rejig the gas pedal response. It might a few mod's to A/C performance, and possibly cruise control response.
