Speed, gears, and MPG''s

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Speed, gears, and MPG''s

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CBR >> Past CBR Models >> CBR 600F4 >> Speed, gears, and MPG''s

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Speed, gears, and MPG''s - 8/14/2008 8:53:18 AM

gr8shot

Posts: 94
Joined: 5/6/2008
Status: offline

Just curious as to what speed/gear combo gets you the best MPG''s. I''m pretty disapointed in my mpg''s. With the mods in my sig, I normally get about 36-38mpg. Had the bike for 2 years and cracked 40mpg once in 7k miles. I commute about 22 miles round trip to work mostly side roads where I run from 35-50 mph. I usually keep the rpm''s between 4500 and 6000, and don''t hot rod it all that much.

Would I do better at higher rpms? or lower? Or what should I do to improve?

_____________________________

2000 CBR F4
20k and counting as of 6-10-08
D&D Exhaust
Jet kit, Grips
CF Mirrors, CF Bar Ends, CF blinkers
Re-paint, and re-road rash courtesy of previous owner

Post #: 1

RE: Speed, gears, and MPG''''s - 8/14/2008 1:18:05 PM

gmay00

Posts: 87
Joined: 3/30/2008
Status: offline

Everything but the exhaust is stock (air filter, gears, sprockets) on my 2000 F4 and I get about 46mpg consistantly. Most of my riding is coutnry roads with few stops and cruising about 60-70mph though. Mine is still under 12k miles so that may be some of it too. I would say the biggest thing against your mpg''s is the jet kit...I''ve heard those hurt a lot..Hope this helps ya..

(in reply to gr8shot)

Post #: 2

RE: Speed, gears, and MPG''''''''s - 8/15/2008 11:10:40 AM

dufferman10

Posts: 35
Joined: 3/30/2007
Status: offline

I too commute about 22 miles round trip from home to work. I get between 45 -48 mpg using 91 octane gas. My bike runs about 6000 rpm at 80 mph and about 5500 rpms at 70 mph. Usually ride about 75 mph to work and back.

(in reply to gmay00)

Post #: 3

RE: Speed, gears, and MPG''''''''''''''''s - 8/15/2008 11:19:31 AM

zSilver_Fox

Posts: 6
Joined: 8/10/2008
Status: offline

Your jet kit is most likely the problem. More fuel used = less mileage, though there can be a balance with the extra power.

(in reply to dufferman10)

Post #: 4

RE: Speed, gears, and MPG''''''''''''''''s - 8/15/2008 11:29:25 AM

gr8shot

Posts: 94
Joined: 5/6/2008
Status: offline

Man I wish I could pull that kinda mpg''s!! I really didn''t buy the bike for mileage lol, but I figured it''d be a good side effect. I''m just kidna disapointed. On the other hand, it''s one of the faster 600cc bikes I''ve ridden, probably thanks some to that jet kit. I''d just like to crack 40 a few times though...

_____________________________

2000 CBR F4
20k and counting as of 6-10-08
D&D Exhaust
Jet kit, Grips
CF Mirrors, CF Bar Ends, CF blinkers
Re-paint, and re-road rash courtesy of previous owner

(in reply to dufferman10)

Post #: 5

RE: Speed, gears, and MPG''''''''''''''''''''''''''''''''s - 8/18/2008 8:36:35 AM

gr8shot

Posts: 94
Joined: 5/6/2008
Status: offline

bump- anyone else thats jetted getting similar mileage?

_____________________________

2000 CBR F4
20k and counting as of 6-10-08
D&D Exhaust
Jet kit, Grips
CF Mirrors, CF Bar Ends, CF blinkers
Re-paint, and re-road rash courtesy of previous owner

(in reply to gr8shot)

Post #: 6

RE: Speed, gears, and MPG''''''''''''''''''''''''''''''... - 8/18/2008 9:11:48 AM

woot

Posts: 785
Joined: 7/24/2006
From: NS, Canada
Status: offline

I''m a bit frustrated with the way people use the words "jet kit". It is not a magical beast that gives horsepower. You jet a bike to get the air/fuel mixture correct. If the mixture is correct, you don''t need a jet kit.

You need to rejet the bike IF the mixture is not right. That happens when you change elevation, you have a new/clean/dirty/better flowing air filter, or you changed the exhaust.

Other things can cause symptoms of poor gas mixture, like a kinked fuel line, out of sync carbs, valves that need adjusting, worn spark plugs, flat battery, stuck choke, stuck float etc. These are not solved by a jet kit. These are solved by fixing the problem.,

Rant mode off.

I have charts in my photo gallery of different gear ratios and speed for the F4.

The best mpg you can get is easy throttle hand, and the right sprockets for the job. -1, +7 is great for stunting, but not great for highway touring. Unnecessarily high revs = poor gas mileage.

_____________________________

2000 CBR 600 F4
Full M4,
-1,+2 520,
Speedohealer (-11.4%), AutoCom Pro, Garmin Nuvi 360 GPS/MP3, Cobra FRS/GMRS , Vortex sliders, mirrored windscreen, Cortech bags and Aux Fuse box.

Safety wired and ready to go

(in reply to gr8shot)

Post #: 7

RE: Speed, gears, and MPG''''''''''''''''''''''''''''''... - 8/18/2008 9:13:00 AM

woot

Posts: 785
Joined: 7/24/2006
From: NS, Canada
Status: offline

On my F4 I get 35-45 mpg. That is with an absolutely correct odometer, and consistent measurement of fuel. I get the best mileage at ~45-50mph on back roads touring, the worst mileage at 65mph+ on back roads squidding.

_____________________________

2000 CBR 600 F4
Full M4,
-1,+2 520,
Speedohealer (-11.4%), AutoCom Pro, Garmin Nuvi 360 GPS/MP3, Cobra FRS/GMRS , Vortex sliders, mirrored windscreen, Cortech bags and Aux Fuse box.

Safety wired and ready to go

(in reply to woot)

Post #: 8