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Discussion Starter #1
Over my last 400 miles or so I have noticed a significant drop in gas mileage. I am getting 35 - 40 where I used to get far closer to 50.
Riding style (mild to spirited but usually under 6500 rpm)or locations has not changed. Temps anywhere from 30 to 70. Mix of interstate and back roads.

What could cause such a drop?

I am running the 43T in the rear.
I have a Jardine pipe but had it when I was getting good MPG's. Recently added handguards and a top box and I inderstand they may cause a bit more drag but not 10-15 mpg worth....

Any suggestions?
 

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Is your air filter dirty or over-oiled? How large are the handguards? It and the top box do impact mpg's to some degree, as does a large windscreen. Tire pressures are good? Are you still using the same brand/quality of gasoline? Keeping the rpm's down helps. Add 7% to your indicated odometer/tripmeter mileage with the 43T to get actual mileage and mpg.
 

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Discussion Starter #3 (Edited)
basic powermadd handguards, stock screen, same fuel as always, stock air filter...maybe it's dirty.
Tires are at 33 and 36 as the old ones were and am taking into account the 7%.
 

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so either its something youve changed on the bike more electrics, changed airflow
somethign has gone out of tolerance on the bike (air filter, timing, tyre pressures)
you've changed something else (eg fuel grade, type calorific value
or possibly you have changed your riding style

or perhaps a comination of 2 or more.

a drop of what you are suggesting is sigificant so its something glaringly obvious.
 

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Top box should help mileage, according to a study done by Craig Vetter back in the 70s. Helps smooth out the "dirty" air behind the rider.
 

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Discussion Starter #8
so either its something youve changed on the bike more electrics, changed airflow
somethign has gone out of tolerance on the bike (air filter, timing, tyre pressures)
you've changed something else (eg fuel grade, type calorific value
or possibly you have changed your riding style

or perhaps a comination of 2 or more.

a drop of what you are suggesting is sigificant so its something glaringly obvious.
I totally agree. could it have anything to do with the spark plugs?
 

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What year is your Versys? How many miles?
 

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By chance did you used to get non-ethanol mixed gasoline and are now getting ethanol mixed gas? In both my 4 wheeled vehicles I lost about 8% in mileage when they switched to the gas and 10% ethanol locally. Last Summer they switched back to straight gas and the mileage came right back.

Another thing to check are your injectors. Dirty fuel injectors will hurt mileage but I wouldn't think it would be quite that dramatic.
 

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Try another gas station, maybe they are cheating. :eek:
Ride her as empty as you dare before you fill her up, pumps are often less accurate at smaller volumes.
 

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My guess would be ethanol gas. When I first got my bike I got close to 50 mpg, all winter long I've only gotten low 40's. That's being easy on the throttle too.
 
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TPS - Throttle position sensor, 3-42 in the manual. If out, can give rich or weak mixture.
 

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My guess would be ethanol gas. When I first got my bike I got close to 50 mpg, all winter long I've only gotten low 40's. That's being easy on the throttle too.
That is good to hear. I got my bike in January and I have been getting a fairly consistent 42 mpg too.

Well, except when I went on a 530 mile long ride one day, where different ridiing style and non-ethanol-poisoned fuel (away from urban areas!) could have made the change up to 47 mpg.
 

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I do not know the details, but don’t forget about winter fuel. Additives are added to the fuel to help keep it from jelling in the colder months. I believe these additives rob some of the fuels efficiency and I would bet that your mileage will go up when they switch back to the summer mixture.
 

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Discussion Starter #19
By chance did you used to get non-ethanol mixed gasoline and are now getting ethanol mixed gas? In both my 4 wheeled vehicles I lost about 8% in mileage when they switched to the gas and 10% ethanol locally. Last Summer they switched back to straight gas and the mileage came right back.

Another thing to check are your injectors. Dirty fuel injectors will hurt mileage but I wouldn't think it would be quite that dramatic.
I sometimes use ethanol blend (89 octane) but generally go with the non-blend at 87 octane.
Is there any safe way to clean the injectors?
 

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Discussion Starter #20
I do not know the details, but don’t forget about winter fuel. Additives are added to the fuel to help keep it from jelling in the colder months. I believe these additives rob some of the fuels efficiency and I would bet that your mileage will go up when they switch back to the summer mixture.
hmmm maybe you are on to something here. I will continue to monitor.
 
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