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I recently purchased an '03 LT with 30,000 miles. I love the bike and have put around 600 miles on her. I have checked my mileage regularly with the on board computer and was averaging 42 mpg. I checked it yesterday and it has dropped to 35 mpg.....all I have done is change the oil using BMW SAE 20W50 and a BMW filter.
I have never experienced this large of a change in any vehicle's mileage.
Any ideas?
Ride Safe!
 

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Use your Trip Odo

Check your milage the old fashioned way before panicking. The computer takes many things into consideration, and it is averaged over the period you are actually running it each time. Also remember that many regions change their formula for the fuel according to weather and climate. I often get worse milage in the winter than in the summer.

HTH,

John
 

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Check the O2 sensor. These can have a dramatic effect on mileage when they fail..

Maybe you can get someone with a GS-911 to scan it...

And don't rely on the BC. It lies.


Good Luck

John
 

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Cold weather will also kill the mileage... I get my best in hot weather at altitudes above 3000 ft.
 

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Discussion Starter #6
I filled the tank this afternoon and calculated my mileage.....EXACTLY 40 mpg. I feel better now and will remember the on board computer is not perfect.
Thanks for the responses...Happy New Year to all!!!
Ride safe!
 

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What time of year and where you buy gas makes a difference. Here in Colorado the formula changes in the winter. And it's all ethanol gas until spring and this lowers mpg. I use 91 octane with a cap full of MMO and my mpg stays at 50. No kidding. I'm 6', 285lbs. My '99 LT has 72k on it.
 

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Lumpy said:
What time of year and where you buy gas makes a difference. Here in Colorado the formula changes in the winter. And it's all ethanol gas until spring and this lowers mpg. I use 91 octane with a cap full of MMO and my mpg stays at 50. No kidding. I'm 6', 285lbs. My '99 LT has 72k on it.
What is MMO? Some type of octane booster?
 

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Mmo

I'm guessing good old "Marvel Mystery Oil"
 

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Mmo

Yep, Marvel Mystery Oil. Some swear by it, others swear at it. I believe it has benefits that improve engine longevity.
 

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You have to reset the trip computer once in a while, especially the average gas consumption and speed. The more you drive around in town the more it pulls down your milage and average speed readings, resulting in lower average fuel comsumption, which is based on a wide range of riding conidtions. Reset it, run it on the highway, then reset it again and run it in town, you will see the difference.
 

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Things I've found that effect MPG..
1- Tires- 880 get better than B020
2- PSI in tires... 48/42
3- Windshield angle...if way up, it blocks the air more
4- right hand- If I'm on the gas harder the gas seems to go away faster!!!
 

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Stop with the grin. Do you realize how much wind resistance there is when you are grinning ear to ear while you are going down the road? Cheeks a flapping, lips a flopping probably costs you 5 miles per gallon.

Ride serious. Frown. Think about the IRS, your mother-in-law or your boss.
 

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Adjustest of BC computer

There are various threads on how to change the BC computer to calculate correctly. I can't remember the excat steps. If I figure them out I will send them.
 

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Mileage!!??

Ya'all are lucky, or maybe smarter than me! I am lucky to get 40 mpg! (2000 LT trike) Chuckle! I'll try MMO!

:)
 

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The new gasolines (especially non Tier 1 gasolines) are causing dirtier fuel injectors, intake valves, and combustion chambers which will decrease performance and mpg. If you have noticed a decline or want to try to do better, you might want to try a fuel system cleaner every 4,000 miles such as http://www.amsoil.com/storefront/api.aspx?zo=1181889 .
 
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