Fuel Economy

[jbfla]

Originally Posted by Eco Mouse

Until we can figure out a way to input the actual front wheel diameter in the computer, it will always yield waaaay too optimistic MPG numbers.

I believe I have shown via GPS that the RX3's odometer is 5% optimistic (with 18" wheel).

Pretty easy to deduct 5% from the odometer reading to obtain a close approximation of mpg.

jb

[Eco Mouse]

Mine's closer to 10% off. That little SpeedoDRD thing is awesome, Spud! Thanks... I see in that thread, you took off 10.2% Do you suppose the .2 is for the knobbies?

[SpudRider]

Originally Posted by Eco Mouse

Mine's closer to 10% off. That little SpeedoDRD thing is awesome, Spud! Thanks... I see in that thread, you took off 10.2% Do you suppose the .2 is for the knobbies?

I suppose the 0.2 percent is for the height of the knobbies. Every knobby tire will have a slightly different circumference, which will change with tire wear. I calibrate the SpeedoDRD with my Garmin GPS receiver. If I change tires, I can easily recalibrate the SpeedoDRD.

[keithmaine]

Originally Posted by Eco Mouse

Mine's closer to 10% off. That little SpeedoDRD thing is awesome, Spud! Thanks... I see in that thread, you took off 10.2% Do you suppose the .2 is for the knobbies?

My bike is off between 10% and 11% with stock tires

[rickosuave1987]

I just saw this thread and found out my OCS is installed upside too...

I've been getting a pretty consistent 50 MPG with corrected mileage (about 5% over on the ODO) and a 13 tooth front sprocket... Maybe having that thing flipped will help get a little more.

[ChopperCharles]

I don't have a plug on the end of my drain line, and my line is much shorter. Could an unplugged campfire tube cause poor gas mileage? Or stalling? Also, just checked, mine is upside-down too.

Charles.