1. Do a search on here. If it's true, then undoubtedly a number of owners will have reported the same.
2. Go the the reviews section. Again, if people have reported this, then it will most likely have been added to the 'what's good / bad' section.
A few reports can be ignored. If a pattern starts to build then it's time to be concerned.
Do also bear in mind that if a car is little-used (I know someone with a 2013 plug-in Prius that's only done 14k miles) then the brake discs will be more likely to get corroded and worn out, simply due to rust forming on the discs and not being 'scrubbed off' by the brakes being used. The rust then goes deeper, and eventually the discs/pads need replacing.
Finally, if it was true, then it would be clobbering the CO2 / 'official' mpg figures, as well as the reported 'real-world' figures in the 'RealMPG' section of this site. Which you can also look up.
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