This is probably a crazy question to post, but here goes.
I own an 2003 Road Glide with 20,000 Miles on it. I have 2 friends that have the same model as I do, One is a 2003 with 38,000 miles and the other is a 2006 with 28,000 miles.
My bike is pretty much stock other than the stage one download and air cleaner, and I have Hooker slip-on Mufflers.
The other 2003 is pretty much the same as mine except he has Rheinhart true duals.
The 2006 has screaming eagle slip-ons and performance gear driven cam.
All of us ride pretty much the same way and time in the saddle.
The question that I have is why would my bike average 47 miles to the gallon and the other 2 only average about 34 - 36 Miles per gallon?
Not that I am complaining, it's just curious to me that there would be that big of a difference.
Thanks for you input.

 

[sm=icon_ladiesman.gif]someone rode the short bus to school and cant do math!!!
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Considering the fact that I keep track of my mileage at every fillup by turning my trip meter to 00 the Math is not at all difficult.
Every single tank of gas that I have calculated comes out to between 47-48 miles per gallon. I just rode from Wittmann to Prescott which is approximately 100 miles each way and I averaged 52 Miles per gallon on the trip which was the same as the friend who went with me and he was riding a Triumph 750.
Thanks

 

My Ultra Classic averages 47 mpg highway.

 

You've got a really good tune job, don't mess with it.

 

It's all in the tuning. Tune it rich and it'll get lousy mileage. I get up to 50mpg with my SG, but I've achieved that only after considerable tweaking of my PCIII map.

 

I get between 45 and 50, and as much as 52 on one particulary slow group ride. Can't complain with those numbers.

 

+1

 

As already suggested, gas mileage has&nbsp\\;\\\\\\;to do with tuning and riding habits. Most good tuner will balance performance and mileage&nbsp\\;\\\\\\;when&nbsp\\;\\\\\\;they tune a bike. I have a well tuned bike and get an average of 40 mpg.
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If a bike running in a lean condition, mileage will be higher. This&nbsp\\;\\\\\\;lean condition can&nbsp\\;\\\\\\;cause the engine to run hot, to very hot. One way to tell is to pull the plugs and take a look. If the insulator&nbsp\\;\\\\\\;is entirely white this would indicate a lean condition. If the plug is dark then this would indicate a rich mixture and&nbsp\\;\\\\\\;reduced gas mileage. Here's more information on reading spark plugs by Doc 1.