The city mileage of the Aprilia RS 660 is not explicitly stated in the sources, but the ARAI claimed mileage is 20.4 kmpl, which is a combined figure and may include both city and highway driving. However, real-world mileage can vary. For instance, some owners have reported around 43.5 US mpg on the road, which could be closer to city driving conditions. Therefore, while the exact city mileage is not provided, it is likely to be around or slightly lower than the ARAI claimed figure of 20.4 kmpl.