Fuel economy.

[(RIP) trickytree]

Last few months or so I've seen fuel economy on my Rockster drop from a pretty consistent 50mpg down to around the 45 mark. Engines just been serviced, including plugs, air and fuel filters but it hasn't made any differance. Bike seems to be running normally, nothing odd to report performance wise. Just over 60k and doesn't burn oil.
One thing I thought of but probably clutching at straws, there's a air temp sensor on the air box, is the motronic using more fuel becouse of the colder weather
TBH I can't remember if I had the same issue last winter. I don't regularly keep a check on economy but I fill up to the trip meter so you get to know how much the tank should take to fill up and recently it's always taking more.
Any ideas?

 

[Tractors are go]

Have you made sure brakes aren't binding slightly ?

It gets worse as they heat up/expand.

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[Deleted account 181015003]

Tyre pressures a bit low ?

 

[Manifold_Burrito]

Have you changed which fuel station you use? Long shot by 5mpg could be poor fuel?

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[(RIP) trickytree]

Have you changed which fuel station you use? Long shot by 5mpg could be poor fuel?

Don't use a regular fuel station, and the problems a couple of months old now.

Tyre pressures a bit low ?

All fine.

Have you made sure brakes aren't binding slightly ?

It gets worse as they heat up/expand.

That's a good call actually, and I do have a full set of pads to go on the bike....and a fluid change and general caliper cleaning session is on the cards.
Having said that, after a ride while pushing the vike around things seem pretty normal. Still, defiantly a job to do.

 

[Deleted account 181015003]

It could be your slowing down more for corners and roundabouts and carrying less corner speed due to road conditions or an increase in traffic that is just knocking the edge of your mpg

 

[jmh]

Could try resetting the Motronic (Engine management)

Disconnecting the batter OR fuse 5 for 10 minutes resets the Motronic. turn the key on, rotate the throttle fully twice, and turn the key off. Your bike will take a couple tanks of fuel to relearn its adaptive fueling values.(If I remember correctly)

Don't know if it will make a difference but costs nothing and easy to try.

 

[*touring ted*]

Lambda sensor on the way out. ECU enriches the mixtures to prevent engine damage.

 

[cartejo5]

When I used to commute all year on my 1100, this time of year when I was using the heated grips would normally see consumption drop from 50's to mid to high 40's.

 

[Slipperyeel]

When I used to commute all year on my 1100, this time of year when I was using the heated grips would normally see consumption drop from 50's to mid to high 40's.

That matches my experience. I put it down to the cold starts needing a richer mix for longer at start up

 

[(RIP) trickytree]

When I used to commute all year on my 1100, this time of year when I was using the heated grips would normally see consumption drop from 50's to mid to high 40's.

That matches my experience. I put it down to the cold starts needing a richer mix for longer at start up

Interesting....wouldn't have thought current drain would be that high but quite plausible.
Ta.

 

[ianboydsnr]

Is it a twin spark model?

 

[(RIP) trickytree]

Is it a twin spark model?

Yes..

 

[Slipperyeel]

Interesting....wouldn't have thought current drain would be that high but quite plausible.
Ta.

Bit of a typo. I meant to say 'longer warm up' with a rich fuel mix.

 

[ianboydsnr]

Yes..

I was just asking, because if it's only firing on one plug, most of the time you only know because the fuel consumption goes up.