Join Date: May 2015
Location: South Florida, USA
Mentioned: 32 Post(s)
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I never hit above 50mpg until recently, with 3k miles on.
In fact, some of my first fuelups where 45, 25, 38, and 44mpg. The 25 was after more than a gallon of fuel had evaporated over the course of 1 week just standing in the sun.
The cbr needs to pass at least 1k miles. Then it only gets above 60mpg if you keep the speed below 60mph.
I may actually hit 66mpg this time.
The higher the speed, the lower your mileage.
You can do 2 things,
1-change sprockets. Change them to 15t front, 35t rear.
2- use a fuel controller in combination with an open exhaust and k&n airfilter.
The first one will raise mpg by about 10%
The second one was a big one for me, because it allowed my bike to rev from 3k rpm instead of 3.5k (or accelerate fast from 3.5k instead of 4k).
The drop in rpms allowed me to ride at 30-35mph in 6th gear, as opposed to 4k in stock 5th gear.
You need to change your stock oil at about 600 miles (I did 300 and 1000 miles), and you're not supposed to do prolonged highway on it until you've logged at least 300miles. (Engine break in).
These cbr and cbfs aren'tvery fuel efficient due to high rpm, and low low rev power.
If you have a black cbr, also make sure you're not parking the bike under the hot sun.
South Florida sun heats up the tank so bad, you could actually burn your hand on it.
I'm currently looking for a tank bag, to protect the tank from sunshine radiation.
The heat makes fuel evaporate through the vent hose, and all models save for Calif models, do not have a carbon canister, but a regular vent hose.
Honda does not recognize the issue, though some other people on this forum have mentioned it as well, and people on the CBR500 forums have complaints about it as well.
Last edited by MeeLee; 04-22-2016 at 01:36 PM.