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Discussion Starter #1
I just bought a 2009 model.
Fuel mileage is a lot worse than my 1993 GL1500.

I tried Seafoam in the tank, but no improvements.

Does anyone have input on this?

Thanks.
Steve, (Toronto, Canada)
:frown2:
 

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How poor is it? Have you checked the tire pressure, dragging brakes? Is the FI light on?
 

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Xenforo vehicle detail line
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And what size windshield does it have on it?
IMO, the windshield is the biggest aggravation on MPG.
I have used a Tulsa Tall on two gl1500s, = 33 mpg
also had one on my current gl1800 = 33-34 mpg running 70 to 75 mph.

Several of us have noted, that if we forget to shift into 5th gear, we can just about empty a tank of gas running in 4th gear at 70 mph. I have done it, it happens.
But, guess what? when you fill up, it takes almost exactly the same amount of fuel.

yes, higher rpm, but the same load, nets the same fuel burned.


Now I have a Madstad windshield which I can drop down to only about 8 inches high, whoa!!! 38-40 mpg??? yup.
 

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Condition of the air filter....??
The air filter doesn't effect fuel injection like it does a carburetor until it gets so clogged it causes loss of power.
 

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Did you get any service records with the bike? Plugs might need to be changed. And as stated earlier, your right wrist and size of the windshield has a lot to do with it also. I always got 40 + on my 02 and 08 Wing.
 

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Bigger windshields will kill mileage of a vehicle that already has the aerodynamics of a barn door, but to say a EFI GL-1800 gets worse than an older carbed GL-1500 … just wow.
 
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