Better mpg help plz - Honda CBR 300 Forum
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post #1 of 57 Old 04-22-2016, 12:11 PM Thread Starter
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Better mpg help plz

I just bought a cb300f about 3 weeks ago and have about 300 miles on it (bought it with 3 miles) spring showers are keeping me off it right now.

I do 34 miles round trip to work about 32 of those are highway miles at speeds of 65 to 70 and I'm only hitting about 52 mpg average. I'm wondering if that's because I'm still in break in window or cause of the high rpms or both. I'm not looking for a fast bike that's why I have my Evo I bought this bike cause of the gas mileage but seem to be hitting low. I had a ZZR600 that hit 45 to 50 mpg so can't figure out why that's all I'm hitting on a 300. Any help will be appreciated.
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post #2 of 57 Old 04-22-2016, 01:26 PM
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Your mpg is on the low end according to FUELLY:
2015 Honda CB300F Mileage
I think it will improve as the motor breaks-in but I get my worst mpg on the highway.
After 600 miles you could try a 15 tooth counter shaft sprocket.
Looking at results on FUELLY you probably wont better 60mpg hiway. Your ZZR600 was more aerodynamic so better hiway mpg.

BTW: I really like the 300f. Excellent urban bike.
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post #3 of 57 Old 04-22-2016, 01:28 PM
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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.
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post #4 of 57 Old 04-22-2016, 02:44 PM
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Put some miles on it, 300 is bugger all and its still tight, get used to how it rides, this is mine, notice how mine is a bit wobbly when i first got it.

CBR300R ABS (Honda CBR300R ABS) | Fuelly

Mine now has 4500 miles on it, I got the 97mpg riding easy all week which was hard lol, one or two low spikes are at 80mph on the motorway, i give it a bit now and then through the week and still get 90mpg usually.
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post #5 of 57 Old 04-22-2016, 03:16 PM
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Quote:
Originally Posted by Mark65 View Post
Put some miles on it, 300 is bugger all and its still tight, get used to how it rides, this is mine, notice how mine is a bit wobbly when i first got it.

CBR300R ABS (Honda CBR300R ABS) | Fuelly

Mine now has 4500 miles on it, I got the 97mpg riding easy all week which was hard lol, one or two low spikes are at 80mph on the motorway, i give it a bit now and then through the week and still get 90mpg usually.
A British gallon is 1.2 us gallons. 97 brit mpg = 81 us mpg
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post #6 of 57 Old 04-22-2016, 05:35 PM
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Quote:
Originally Posted by Mark65 View Post
Put some miles on it, 300 is bugger all and its still tight, get used to how it rides, this is mine, notice how mine is a bit wobbly when i first got it.

CBR300R ABS (Honda CBR300R ABS) | Fuelly

Mine now has 4500 miles on it, I got the 97mpg riding easy all week which was hard lol, one or two low spikes are at 80mph on the motorway, i give it a bit now and then through the week and still get 90mpg usually.
Mark..So once in a while you hit 80MPH on the highway. What is you normal cruising speed...60 to 65 MPH? Or less..

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post #7 of 57 Old 04-22-2016, 08:10 PM Thread Starter
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Mark do you have any mods on your bike? Is that how you get that good of mpg.
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post #8 of 57 Old 04-22-2016, 08:20 PM Thread Starter
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Quote:
Originally Posted by MeeLee View Post
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.
Is there specific sprockets that are better to use and how much does the sprockets drop the rpms right now at 65 mph I'm running at 7k rpms?
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post #9 of 57 Old 04-22-2016, 09:39 PM
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I've subscribed to the "run it hard as possible the first 1K miles" theory, for better break-in/mpg for the rest of the life of the engine.

No matter how small the engine, it takes a certain amount of energy (gas) to overcome air drag @ 70 mph. Theoretically the faired CBR300R would get the best mpg, probably around 40-45 mph in 6th gear.
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post #10 of 57 Old 04-22-2016, 10:43 PM
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Originally Posted by NightGlider View Post
Is there specific sprockets that are better to use and how much does the sprockets drop the rpms right now at 65 mph I'm running at 7k rpms?

The most common and cheapest and easiest sprocket conversion is to change the front sprocket from 14 teeth OEM to an aftermarket item of 15 teeth.
This is a 7% change in gearing.
You can go further by changing the rear sprocket from OEM 36 teeth down to 34 (as I have done) or 35 teeth. But rear sprockets are more expensive and time consuming to change.


With the 15/34T combo you will have changed your gearing by 13% and will now be pulling 74MPH (GPS verified) at 7000RPM instead of 65MPH as you are now.


There is a separate gearing thread if you wish to delve into this subject further:
http://www.cbr300forum.com/forum/eng...tml#post201122

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Last edited by kiwi rider; 04-23-2016 at 03:20 AM.
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