Bro it depends upon your driving condition. That how much fast you want to drive. I think u want the car to be more economical the fast because it is design for economical and daily driven luxuries use. The best rpm for the car to be driven at best fuel average is 2 - 2.5 rpm. Either you can take your car to 6 rpm if you want the car to be aero plane. Higher than this rpm of 6 is totally danger to your car's engine which can be blown out.
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