I had a rc 200 for 1 year..... The power of the bike will amaze you like anything else... But on changing spares will put a hole in your pocket for sure...(more than the spare parts cost, service charge will give you a heart attack) Also if you are riding with shorts on any short rides, your legs will be burnt by the radiators. To get mileage from a Duke is another thing (based on your riding style) I got a 38 kmpl.
Cbr 150r could be a better choice as the riding position is more relaxed than R15 but you won't get engine kill switch and switch cluster will look like a unicorn's... Of course Honda service centers will also shoot a hole in your pockets.. But you can be more relaxed and you can get decent mileage around 40 - 45kmpl
My suggestion would be to go with cbr 150r comparing with gixxer sf
Test ride both the bikes to get better understanding
On cost saving purpose you can go gixxer not with gixxer sf (extra 15000 for plastic is not worth it)
Also try test riding RTR 200



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