The fuel mileage or fuel efficiency of a motorcycle can vary depending on various factors such as riding conditions, riding style, maintenance, and individual motorcycle variations.
The Honda CBR 250R is known for its good fuel efficiency, especially when compared to larger displacement sport bikes. On average, riders report achieving city mileage (in urban riding conditions) of around 25-35 miles per gallon (mpg). Highway mileage (during constant-speed cruising) can range from 45-60 mpg.
Keep in mind that these figures are approximate and can vary depending on factors such as traffic conditions, terrain, rider weight, and riding habits. It's always a good idea to track your own fuel consumption over several refills to get a more accurate understanding of the fuel mileage you can expect from your specific riding conditions and habits.