Your Average MPG Is Not Your True Average MPG - Victory Forums - Victory Motorcycle Forum
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post #1 of 27 (permalink) Old 12-07-2010, 07:45 PM Thread Starter
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Default Your Average MPG Is Not Your True Average MPG

I have barely turned the first 1,000 miles on my new Cross Roads, and loving the bike a whole lot.

Last week I've posted in a different tread that I was testing a theory about the average fuel consumption we're getting, and today I have finally completed my test.

As some of you are aware, the Cross Roads does not come with the instrument cluster unlocked. A $50 fee, and my local dealer has unlocked it for me with their digital wrench, and among other useful data, I now get to see my instant fuel consumption and average miles per gallon. Up until now I was tracking my MPG by filling up the tank, and resetting my trip meter at each fill-up. Then it was a matter of dividing the miles traveled since last fill-up by the gallons of fuel displaced. I have tracked my MPG since day one, excluding the very first tank the bike came with, and another instance when I had not fueled up completely.

Here are my MPGs as I have recoded, along with the date of fuel-up, the miles ridden since last fill-up, and the gallons of gas displaced:
11/05/10 152.6mi 4.032gal 37.8mpg
11/12/10 155.3mi 4.144gal 37.5mpg
11/16/10 148.9mi 4.111gal 36.2mpg
11/19/10 150.0mi 4.073gal 36.8mpg
11/27/10 165.8mi 4.415gal 37.6mpg
12/07/10 173.1mi 4.459gal 38.8mpg

I have reset the average miles per gallon for the last tank I used, and the instrument cluster has displayed 42.1mpg. Compare that to the 38.8mpg I have measured, and you'll notice that the bike reports an exaggerated MPG measurement. It's off by more than 3mpg. It might not seem like a lot, but that's from just one tank.

It was interesting because another fellow rider here on the forum who was reporting lower than the others MPG was also riding a Cross Roads. I wondered how could the XR get worst MPG than the XC. Well, I'm going to venture nobody on the XC measured the consumption, but took the bike's readout for granted, while the XR, which doesn't come with the Average MPG function unlocked, forced its riders to do the measurement the old fashion way.

I will continue to record my MPG and will update again as I burn more tanks, and track the difference between what the bike reports, and what I actually get. If you'd like to try it out and make sure it's not just me, please do so and post your findings.

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post #2 of 27 (permalink) Old 12-07-2010, 08:19 PM
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Not disputing your findings, but bare in mind that you can not figure further then one point past the decilmal. Trying to figure hunreths leaves to many variables.
That said your method is MUCH more acurate then the trip computer figuring pulse width vs speed times distance. All it takes is a minor variance in fuel pressure to throw it a curve
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post #3 of 27 (permalink) Old 12-07-2010, 08:29 PM
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I have a 2010 XC and have noticed that the computer average MPG is about 3 to 4 miles higher than what I figure the old fashion way. But, heh, it is a nice feature!!! It may not be spot on, but it at least gives you an idea if your getting better or worse mileage depending on your riding style.
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post #4 of 27 (permalink) Old 12-07-2010, 09:59 PM
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Every car I've had that had the MPG was off anywhere from 3 - 6 MPG.

Just for giggles I was going to LA in my 2001 Vette. Since it was the wee hours of the morning I decided to coast into the Valley as much as possible. My MPG went up to 60MPG. Of course as soon as I got on it the MPG's dropped.

Like Kevin said there are a lot of variables with the trip computer to be as accurate as the tried and true manual mathematics.
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post #5 of 27 (permalink) Old 12-07-2010, 10:00 PM
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Crossraods my XC does the same. I knew the mpg on the dash could not be right when I seen 99 mpg going down a hill with the cc on. This was coming home from picking it up.
I have gotten as high as 48.2 mpg and as low as 39.3 mpg
I seem to be getting my best mileage at 60 degrees and cruising at 58 mph in 6th.
It is something to talk about but that is about it. It will increase after I get some mile some it.

dd
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post #6 of 27 (permalink) Old 12-08-2010, 11:29 AM Thread Starter
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It's no biggie. I just wanted to point this out because while comparing gas mileage, some of us (XR locked) measure the MPG differently than the rest (XC & XR unlocked). Like I said, I will continue to do my old school measurements for a while as I am curious of what the average difference really is.

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Riding: 2011 Cross Roads & 2016 Springfield
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Blest with victory and peace, may the heav'n rescued land
Praise the Power that hath made and preserved us a nation.
Then conquer we must, when our cause it is just,
And this be our motto: "In God is our trust."
And the star-spangled banner in triumph shall wave
O'er the land of the free and the home of the brave!
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post #7 of 27 (permalink) Old 12-08-2010, 01:53 PM
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correct me if I'm wrong...it is my understanding that the read out for mpg on the display gives you the CURRENT mpg, as you travel, then holds the last figure recorded by the ECU...not the average per tank. The pen and paper methed gives you a good average per tank or fill-up. No rocket science there.

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post #8 of 27 (permalink) Old 12-08-2010, 01:58 PM Thread Starter
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Quote:
Originally Posted by sgtfixit View Post
correct me if I'm wrong...
Very well, since you've asked for it, I shall have the honor.

Quote:
Originally Posted by sgtfixit View Post
it is my understanding that the read out for mpg on the display gives you the CURRENT mpg, as you travel, then holds the last figure recorded by the ECU...not the average per tank. The pen and paper methed gives you a good average per tank or fill-up. No rocket science there.
You might have overlooked this sentence out of the original post:
Quote:
"I have reset the average miles per gallon for the last tank I used, and the instrument cluster has displayed 42.1mpg."
Or perhaps I wasn't clear enough myself. At the time of my second to last fill-up, I have reset the average MPG displayed by the motorcycle, so it showed blank. I then filled up my tank, and rode away. At the end of that tank (very last fill-up), the average MPG was 42.1mpg, while the calculated figure was 38.8mpg.

Hope this clarifies it.

Please add your bike's year and model to your signature. Here's why.
------------------------------------------------------------------------------
Riding: 2011 Cross Roads & 2016 Springfield
------------------------------------------------------------------------------
---------------------------------------
Blest with victory and peace, may the heav'n rescued land
Praise the Power that hath made and preserved us a nation.
Then conquer we must, when our cause it is just,
And this be our motto: "In God is our trust."
And the star-spangled banner in triumph shall wave
O'er the land of the free and the home of the brave!
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post #9 of 27 (permalink) Old 12-08-2010, 05:24 PM
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correction noted. Guess I asked for it!

What I was trying to communicate was that the read out is only accurate while moving. It does not show a tank average.

And I agree...the only accurate way to get a TANK average is the manual method.
I have yet to get anything better than 39 mpg, but I drive it like I stole it on a regular basis! I bought it to play...not commute.

Love this forum!

MSgt Ret. Security Forces USAF/Santa Maria, CA
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post #10 of 27 (permalink) Old 12-08-2010, 09:03 PM
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Quote:
Originally Posted by rdeerx View Post
I have a 2010 XC and have noticed that the computer average MPG is about 3 to 4 miles higher than what I figure the old fashion way. But, heh, it is a nice feature!!! It may not be spot on, but it at least gives you an idea if your getting better or worse mileage depending on your riding style.
just a doo-dad really...but there is one do-dad i do use and that is the key time-timer...(XC) this is great for long distance as i used to have to keep track of stops and such to get my roll time....as i have just been local since my last service, i am timing that and just discovered that it rolls over at 24 hours...(or i accidentally reset it) kinda like my trip meter on the honda rolls over at 1k....

Tucson
2010 XCountry

Last edited by gulliverstoe; 12-08-2010 at 09:08 PM.
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