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Old 07-07-2013, 08:47 AM   #1
Frostback OP
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Myths inside my helmet

Lots of time to think with ear plugs in and a steady drone.

I have developed an algorithim of mileage and speed.

first I noticed I could make the Edmonton to Calgary run on one tank (R12 GS, 200 miles) if I kept it at 65 but not at 75 mph given steady speed, no wind, no stops, no hills, slab the whole way.

Then I made up the 120 rule.

120 - my average speed = miles per gallon for my bike.

example: 120 - 65 = 55 mpg. And 220 mile range
120 - 75= 45 mpg . And 180 mile range

The slower speed lets me skip an exit and gas up, hence my total transit time to Calgary is shorter by going slower (queue the little light bulbs in my brain).


Clearly the Iron butt guys know all about this concept
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Old 07-07-2013, 09:00 AM   #2
Yossarian™
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Originally Posted by Frostback View Post
Then I made up the 120 rule.

120 - my average speed = miles per gallon for my bike.

example: 120 - 65 = 55 mpg. And 220 mile range
120 - 75= 45 mpg . And 180 mile range

The slower speed lets me skip an exit and gas up, hence my total transit time to Calgary is shorter by going slower (queue the little light bulbs in my brain).
Have you proven this out at 10mph? Or better yet, at 110mph?
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Old 07-07-2013, 09:03 AM   #3
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The myth inside my helmet is that I can actually sing.

Marc
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Old 07-07-2013, 09:19 AM   #4
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The myth inside my helmet is that I can actually sing.

Marc
The myth inside my helmet is that ONLY I can hear me sing
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Old 07-07-2013, 11:07 AM   #5
Frostback OP
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Oh Lomax, silly engineer, nobody expects this relationship to be linear at the extremes but my highway riding was pretty well constrained between 60 and 80 mph (avg read on digital log) on my recent 4,000 miler to Phoenix and back. I don't have an autobahn for 110 mph or the patience for burning 4 gallons at 10 mph so they are not relevant.

Maybe I should call this a bounded algorithm at common 6th gear highway speeds.

Now I am seeking a sweet spot of tradeoffs between vibration, mileage, and speed.

Lee
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Old 07-07-2013, 03:34 PM   #6
Barnone
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Originally Posted by Yossarian™ View Post
Have you proven this out at 10mph? Or better yet, at 110mph?
At 10 mph the OP would have to stop and take gas out of his tank.
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Old 07-07-2013, 04:43 PM   #7
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The slower speed lets me skip an exit and gas up, hence my total transit time to Calgary is shorter by going slower (queue the little light bulbs in my brain).
Have you timed a gas stop to verify this part?

Once upon a time, I and three college buddies drove a van and trailer to New York for a Mini Baja race. On the way there we were able to track mileages over several tanks and gas stop times. On the way back we whipped out the calculators (engineering buddies) and figured out that from 55 up to 75 mph, faster is faster.
At 85 mph our overall speed went down, but so did our expected lifespans (20' poorly loaded box trailer) so we didn't worry about that.

Rochester to Corvallis in 46 hours. Nearly beat the guys who flew back
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Old 07-07-2013, 07:27 PM   #8
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Originally Posted by Barnone View Post
At 10 mph the OP would have to stop and take gas out of his tank.
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Old 07-07-2013, 07:38 PM   #9
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Crazy Canadian...

...which means I'm bound to end with similar thoughts, being a crazy Canadian myself.

Myth in my helmet: How easy EVERY project is *going* to be + my own skill level = so many unfinished ideas...LOL
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Old 07-07-2013, 09:14 PM   #10
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Quote:
Originally Posted by Lomax View Post
The myth inside my helmet is that I can actually sing.

Marc
i sound just like robert plant when i sing in my helmet.

Quote:
Originally Posted by rob feature View Post
The myth inside my helmet is that ONLY I can hear me sing
hmmmmmm, never really considered that...
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Old 07-08-2013, 07:15 AM   #11
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I rode 4500 kms from Vancouver to Toronto in 4 days, after riding a casual 12,000 kms in 3 weeks. During the casual ride running between 100-110kph I can get 425kms until reserve light comes on. On my high speed run home, running 120-130kpm I get 390-400kms until the reserve light comes on. The first time it happened I thought I had not filled up properly, then I realized the speed differential.
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Old 07-08-2013, 02:49 PM   #12
dwoodward
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i sound just like robert plant when i sing in my helmet.
Young Robert Plant, or old Robert Plant?

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Old 07-08-2013, 05:53 PM   #13
green hell
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Young Robert Plant, or old Robert Plant?

why young robert plant, of course!



back on topic, my moto math is this: the speedo on my r65 is off quite a bit, and i calculate the correct speed by dividing the indicated kilometers per hour by two. this value is my actual speed in miles per hour, verified by gps.
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