Fuel consumption vs RPM vs throttle setting?

[Mrs Shrek]

Might have to change your bike. I only get 30 kms/l

[DrunkenMistake]

be interesting to see if an 88 to 90 cbr owner could compare to 23. they got a bit more high performance after the 86/87 ones i think

I got an 89 CBR250 MC19, with about 6,300 km on the clock and I usualy ride an average speed of 100-110 and I can get about 18 - 19km/l In the manual it says it can do 300km on a tank of gas including the reserve and It falls about 20 km short of meeting that mark.

[DMNTD:Me]

For the love of all things shaven...just ride your bike and enjoy it

[p.dath]

my g/fs CBR gets 23! i expected range to me closer to 20 even if hers is better than average

Trying to remember back to my CBR250RR. I'm pretty sure it didnt get close to 20l/100km. 17 sounds more reasonable to me ...

[Spearfish]

Unless you can put it on a dyno its hard to know where the engines sweet spot starts, and especially, finishes and how that relates to your own riding situation.

A rudimentary way is a be in to high a gear then open the throttle and feel when it starts to pull take a note of the rpm then do a run at your preferred riding speed and gear and see if your in the rev area the engine felt strongest on the test, maybe a lightly larger rear cog would get you just inside the power area. If you just drop out of top gear the next one down could be slightly too low with unnecessary revs for touring if you know what I mean.


I did the same experiment with a small xl125 carrying just my fat arse then changed the gearing slightly had the same economy and slightly more speed. I did the same thing when I loaded up the bike with camping gear and had better numbers all-round than using the standard gearing.

[SMOKEU]

Trying to remember back to my CBR250RR. I'm pretty sure it didnt get close to 20l/100km. 17 sounds more reasonable to me ...

Most V8s wouldn't even drink that much.

[george formby]

I have always been led to believe that it is not just revs that effect performance & fuel consumption. If your in 6th at 100kmph but the revs are to low for the motor to make decent power your flogging it. Better in a lower gear & higher revs with less load on the motor & a smaller throttle opening.
Possibly, maybe, dunno. I make coffee.

[Jantar]

Fuel consumption = rpm² x displacement.....

So why does my 1000cc VTwin use more fuel at 4000 rpm than my 1200cc IL4 did at 4500 rpm?
(Then there's my 500cc which uses twice as much fuel at 3500 rpm than either of them.)

[_Shrek_]

Might have to change your bike. I only get 30 kms/l

30ks per ltr thats coz you only do'n 80-90k's an hr

but on a good note I'm getting 19.5 k's to the ltr not to bad for a 250kg tank + a Shrek