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Old 08-12-2012, 11:53 AM   #16
dduelin
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I have about 1400 miles on my NC700X now. These receipts are from riding yesterday and today. Based on cross checking several times against a Garmin 2730 my odometer is off about 2% and the miles per tank written on the receipts is corrected as close as I can get it. Understand this ........ I made no special attempts to raise mileage by coasting, being towed, tailgating, riding downhill for 50 miles - I live in FL. Temperatures were 75 to 95 degrees F with high humidity. I weight 152 lbs and always wear ATGATT. I had a few lbs in the not a tank storage compartment, tool kit, air compressor, tire tools, water bottles.

The receipt on the upper left represents about 30 miles of urban interstate at +/- 70 mph. About 15 miles was stop and go urban 25-45 mph roads. I rode the rest of it on rural two lane roads posted at 55-60 mph. In city traffic I ride defensively and generally don't speed unless the traffic flow requires it to maintain a safe position. On open roads I ride speed limit plus 5 to 15 as needed (or desired). Sometimes more. This is not creeping along behind a Prius trying to get 50 mpg, this is real world motorcycle riding, a Saturday morning ride. This tank returned 73.88 mpg on up to 10% ethanol 89 octane mid grade.

The top right was about the same type of roads without the interstate travel, all two lane rural roads posted 55 or more, a few miles of urban 25-55 mph roads getting out of town. I think I used 10% E 87 octane regular for the first time this fill-up. 73.9 mpg.

Bottom left was 87 octane E10. I was riding with a friend on open rural roads at 55 to 75 mph. Stopped and ate breakfast along the way. Mileage dropped to 71 mpg.

Bottom right was different, a ringer, an organic cotton dressed woman behind the wheel of a Prius, a real attempt to ride slow. Painfully slow. I picked a road home, A1A from Fernandina Beach, FL to Jacksonville were the limit is 55 but I could safely ride 45 to 50 mph with no stops in between. I left one gas station and rode non-stop to another one. This was shockingly boring riding about 30 miles at 50 mph but I wanted to see if I could bust 80 mpg. I will probably never ride the bike again like this as there is real danger of falling asleep and crashing. 90 + mpg.

That's it, I am not saving any more receipts and simply going back to riding for the pleasure of it. The mileage is just a bonus.

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dduelin screwed with this post 08-12-2012 at 08:50 PM
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Old 08-12-2012, 07:52 PM   #17
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DD,

Great write-up brother,

That is some swell gas mileage, I must say.

Kicking my ozone-frying KLR's ass you are.

Enjoyed the comprehensive report, keep em coming from different angles, that bike is pioneering some fuel-economy ground me thinks. Gettin scooter mileage out of 700. Hmm, and it's not even a step-through!
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Old 08-12-2012, 08:51 PM   #18
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Originally Posted by dduelin View Post
Bottom left was different, a ringer .... 90 + mpg
Impressive numbers and a very appealing bike. However, the engineer in me wonders if the mileage calculated from a 30 mile ride can be very precise ... If you're adding less than a gallon, a few ounces variation in your fill level can make a pretty big difference in MPG. Still, the 70-something MPG tanks seem very realistic. This bike would be a great replacement for my VStrom, which never really sees anything rougher than a few hundred yards of packed dirt occasionally.

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Old 08-12-2012, 09:15 PM   #19
dduelin
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Originally Posted by dman View Post
Impressive numbers and a very appealing bike. However, the engineer in me wonders if the mileage calculated from a 30 mile ride can be very precise ... If you're adding less than a gallon, a few ounces variation in your fill level can make a pretty big difference in MPG. Still, the 70-something MPG tanks seem very realistic. This bike would be a great replacement for my VStrom, which never really sees anything rougher than a few hundred yards of packed dirt occasionally.

-dman
I agree. I try to get at least a 100 mile sample and I also should have gone back to the original pump to remove any variation in pump calibration. On the other hand, I never have bought a motorcycle in order to get good mileage or save money. I ride for the pleasure of it and riding those 30 miles was about all I could do. The 90 mpg sample could be actually more or less and still not be any less remarkable for a 670cc motorcycle that is really fun to ride. As more people buy these and the data points accumulate I know 70+ mpg results are here to stay for average riders just out riding and the eco-modders are going to really have fun.
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Old 08-13-2012, 07:19 AM   #20
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This is my fuel log so if you see any mistakes please let me know! I want to be as accurate and honest as I can, good or bad.
If I seem anal about fuel mileage, its because I am! but I do like to have fun and will take bad fuel mileage for a speed run.
For the record, I fill until the tank will not hold any more fuel. I top it completely off.

07/27/12
1st fill up, I topped the tank off because the dealer didn't.
I added 1.896 gallons of 87 octane no ethanol.
3.249 per gallon total $6.16

08/06/12
I rode the speed limit from 55-70 mph. And shifted around 3,000 rpm.
I added 3.1206 gallons of 87 octane no ethanol today. 236.1 miles on the clock. This tank will be off by 13.7 miles So I actually had 222.4 miles on this tank.
222.4 miles / 3.1206 gallons = 71.26834583092995 mpg


After this tank, I will guarantee my mileage will be accurate to the odometer.
I set my GPS when I filled up the second tank, so we can see how far the odometer is off on this tank.
I checked the GPS and it is very close to the speedometer less than 1 mph difference.




07/27/12
I added 1.896 gallons to the dealers initial fill. The NCX had 13.7 miles on the clock.
08/06/12 I added 3.120 gallons with 236.1 miles on the clock, - 13.7 miles = 222.4 miles on this tank.
Both tanks were 87 octane with NO ETHANOL. Actual mileage is 71.26834583092995 mpg
on this tank.


08/12/12
I added 3.568 gallons of premium non ethanol gas at 3.779/gallon.
I used premium because the regular had ethanol in it.
I rode 242.5 miles per the odometer and 240.10 per the Garmin 60CX.
Total miles on the odometer is 478.8-236.1= 242.7 There is a .2 difference between trip and odometer?
242.5 / 3.568 = 67.9652466367713 mpg per trip odometer.
240.10 / 3.568 = 67.29260089686099 mpg per GPS 60CX
242.7 / 3.568 = 68.02130044843049 per odometer.
I am going to use the odometer for my mileage, even though it is not exact.
I had some spirited riding on this tank because I tried to outrun a rainstorm. I lost and still ended up soaked from head to toe.


08/13/12
I added Non Ethanol premium today because I rode way too fast on this 48.4 mile ride. I didn't want to distort a full tank because of some wide open jaunts and some speed testing.
Amount of fuel was .687 gallons @ $3.779 per gallon
The odometer read 527.1 miles - 478.8 = 48.3 miles / .687 gallons = 70.3056768558952 mpg
The trip read 48.4 miles / .687 gallons = 70.45123726346434 mpg
The GPS read 47.67 miles / .687 gallons = 69.38864628820961mpg


For the record. Thanks for the pure gas link Garp! Even though I have to get premium gas I can get it very close to my work!

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Old 08-13-2012, 08:35 PM   #21
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If I seem anal about fuel mileage, its because I am!
MPG to 14 decimal places? Anal, no. BSC, prolly.
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Old 08-14-2012, 01:38 AM   #22
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This is my fuel log so if you see any mistakes please let me know! I want to be as accurate and honest as I can, good or bad.
Well, you asked, so...

Significant figures! If you're dividing or multiplying, you need to be looking at the total amount of significant figures in your measured values; specifically, the number with the least amount of sig figs. For example:

Quote:
222.4 miles / 3.1206 gallons = 71.26834583092995 mpg
The value "222.4" has 4 significant figures. The value "3.1206" has 5 significant figures. After division, you get 71.26834583092995, a value with 16 sig figs. Taking into consideration sig figs, as you should in these scenarios where the values were taken from measurements, your calculated mpg should also yield a value with 4 sig figs (the same amount as the value with the least sig figs in the original calculation). So, your mpg was 71.27 in the above example, after of course rounding that last significant digit. Those 14 extra digits are basically gibberish with respect to your actual mileage. Neither your GPS, your odometer, nor Honda's volume measurements were taken with equipment with that level of accuracy.

But for the sake of practical, real world mpg calculation, I'd just keep a decimal or two.

I'm tired and have had too many beers. If any of you gentlemen find the above to be too simplified, too boring, or just outright wrong, well, frankly my dear, I don't give a damn.
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Old 08-14-2012, 06:31 AM   #23
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That's copy and pasteI just care about the 72.1. I was just too lazy to delete the 6834583092995
I'll make a point to delete the gibberish next time
"I'm tired and have had too many beers" Sounds like fun
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Old 08-14-2012, 04:21 PM   #24
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Originally Posted by opmike View Post
Well, you asked, so...

Significant figures! If you're dividing or multiplying, you need to be looking at the total amount of significant figures in your measured values; specifically, the number with the least amount of sig figs. For example:



The value "222.4" has 4 significant figures. The value "3.1206" has 5 significant figures. After division, you get 71.26834583092995, a value with 16 sig figs. Taking into consideration sig figs, as you should in these scenarios where the values were taken from measurements, your calculated mpg should also yield a value with 4 sig figs (the same amount as the value with the least sig figs in the original calculation). So, your mpg was 71.27 in the above example, after of course rounding that last significant digit. Those 14 extra digits are basically gibberish with respect to your actual mileage. Neither your GPS, your odometer, nor Honda's volume measurements were taken with equipment with that level of accuracy.

But for the sake of practical, real world mpg calculation, I'd just keep a decimal or two.

I'm tired and have had too many beers. If any of you gentlemen find the above to be too simplified, too boring, or just outright wrong, well, frankly my dear, I don't give a damn.
what is the accuracy of the pumps? +/- 1% or something.? I mean, with this bike it might make a big difference.
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Old 08-15-2012, 08:07 AM   #25
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what is the accuracy of the pumps? +/- 1% or something.? I mean, with this bike it might make a big difference.
All I know is that when I compare my Goldwing or TW200 at 60 mph nor higher, The NC beats both with ease!
The Goldwing beats both for Highway/touring and the TW wins off road though. I like all my bikes equally! Just like my kids.

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Old 08-21-2012, 11:13 AM   #26
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NC700X MPG so far.

NC700X

First tank 77.5 MPG (US gallons)
Second tank 80 MPG (pure gas - no ethanol)

About to fill again and it looks to be at least over 70 mpg again. Avg speed 45-50 mph. Some interstate at 65 but not much. Solo riding. Easy on the throttle.

Greg
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Old 08-21-2012, 06:18 PM   #27
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That is amazing mileage 670. I'm too lazy to get up early enough to ride less than the speed limit, generally +5.
But I still manage around 70 mpg. I think the interstate hurts my mileage the most though.
Maybe I will get a day where I can ride at a leisurely pace and try to be your high!
80 mpg will be hard to beat that's for sure.
90 mpg will be about impossible for me to beat DD!
But I will give it a shot.

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Old 08-21-2012, 06:52 PM   #28
dduelin
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That is amazing mileage 670. I'm too lazy to get up early enough to ride less than the speed limit, generally +5.
But I still manage around 70 mpg. I think the interstate hurts my mileage the most though.
Maybe I will get a day where I can ride at a leisurely pace and try to be your high!
80 mpg will be hard too beat that's for sure.
I already got 90 earlier in this thread. It was easy, just ride a steady 50 mph and try not to fall asleep and crash.
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Old 08-21-2012, 08:24 PM   #29
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I already got 90 earlier in this thread. It was easy, just ride a steady 50 mph and try not to fall asleep and crash.
I hope to ride with you one day DD! Maybe soon I will get the 90 mpg mark. You set the mark very high indeed.
See you at the NC forum!
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Old 08-28-2012, 08:54 AM   #30
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I'm getting closer dduelin, 75.5 mpg US riding some very fine roads in NW Arkansas.
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