MOTOBRICK.COM
MOTOBRICK.COM => The MBdotCOM Community Center => Topic started by: F14CRAZY on August 12, 2014, 05:29:24 PM
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What kind of fuel economy do you guys get? I took up tracking the fleet's consumption using Fuelly (free at fuelly.com)...
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My lowest MPG was during a freeway run last weekend, averaging 80 mph or so, while the highest including commuting but most of that mileage was from a two-up ride, mostly cruising at 60 mph.
I read some spec somewhere that a K75C should get like 56 mpg at a steady 60 mph but I don't really see that happening.
I added some Sea Foam to my gas a few fill-ups ago. Most of the time I fill up with Sam's Club gas (87 octane) and have the side cases on
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I get around 45 mpg as an average on my K1100LT but I can't stick to a steady 60 mph!! For some reason I keep going faster!!
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Just figured a tank today and got 49mpg, 4.3 US gallons. So far my best tank.
Which btw, I'm cruising along and realized I'm at 200 miles and the reserve light hasn't come on. I stop, pop the cap and see what I got left. Start the bike back up and the reserve light is on. Ten miles later I'm filling up.
Could the reserve sending unit be affected by the vacuum release of the cap and could I have a pinched vacuum line?
Last time I remember the reserve light coming on it was around 190 miles but again that tank got 45 mpg if I recall. :dunno
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When my reserve light comes on I can pump like 3.5 gallons...I guess staying on the cautious side is better than pushing it but oh well I've got a fuel gauge
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I stop, pop the cap and see what I got left. Start the bike back up and the reserve light is on.
Did you keep it upright or use the sidestand? Float is on the right side.
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I stop, pop the cap and see what I got left. Start the bike back up and the reserve light is on.
Did you keep it upright or use the sidestand? Float is on the right side.
Always upright.
Side stand has been removed.
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(https://badges.fuelly.com/images/sig-metric/141829.png)
My best has been 3.9 L/100km and that was just after I rebuilt the whole bike. It was so low that I thought it an anomaly. So far, on straight highway runs, I'm getting a very close 4.1 - 4.5 L/100km, so it may not be an anomaly.
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I'm getting the same fuel economy as Zipster on my K11RS...averaging anywhere between 46-50 mpg in the twisties here in North Georgia mountains maintaining legal (albeit very difficult to do) speed limit.... :hehehe
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By my calculations (and we all know how bad they are ;) ) I'm getting around the same as F14, from my 75... (54mpg UK, 45mpg US - from a base figure of approx average of 12 miles per litre.)
Mine doesn't seem to alter wherever I go on whatever roads - town/open road/motorway are to all intents the same 'economy'.
I'm kinda hoping some service parts will up that figure a little though...
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I'm in the mid 40's with purely inner city type riding, stop light every two blocks type of commuting. If I get to do a whole tank on the highway which tends to be a hilly highway then I'm in the high 40's.
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Ave 47mpg(UK gal) from my 16v K100RS,not thrashing it but definitely not holding back.
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I have been keeping track of fuel efficiency of my K75RT for the past 5000 miles.
Running one up at 65-75mph 90% of the time on freeways I am getting a consistent 46mpg (U.S. gallon) on 10% ethanol and about 47-48 on ethanol free gas.
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So you USA guys are getting around 50mpg: is that on a US gallon of 6 pints? :dunno2:
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8 pints in a US gallon
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I assume that you guys who are getting high 50's to 60 mpg are talking about 10 pint Imperial gallons.
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47 mpg overall. If I leave the side cases off, usually around 49. Mostly commute to work miles.
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8 pints in a US gallon
Yes, and 8 pints in an Imperial galllon.
US pint = 16 oz
Imp pint = 20 oz
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Every gallon has 8 pints in... Pints vary though.
Personally, I run off litres as a non-variable base and convert as required. 4.54 litres in an imperial (uk) gallon. 3.8litres in a US gallon - close enough for government work.
Of course, if you want to get very pedantic you should weigh it.... 1litre of fuel is lighter at 30c thab it is at 15c. We should all work in lbs/kilos instead when calculating efficiency.
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I've just checked online: 1 US gallon = 6.66 pints :dunno2:
1 UK gallon is 8 imperial pints
Doesn't matter if you change to litres....the conversion factor is still different!
SO....how many Imperial Pints make a US Gallon...6 pints?
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My point with litres is that all over the world a litre is a liter is a litre, all of them, wherever you are, are 100cl or 1000ml. (Plus, because we buy fuel priced by the litre here it's a consistent start.)
An imperial (UK, Canada, etc. - mainly ex-commonwealth) gallon is 8 imperial pints and is 4.54609 litres. It is also just about the same (temperature and atmospheric pressure dependant) as the now defunct US 'dry' gallon.
A US gallon is 8 US pints and is 3.78541 litres.
Over the many years, there have been nearly 20 different sized gallons in statute use - these ranged in size from roughly 3.5 to 4.7 litres.
Even comparing the two by using fluid ounces is off, there is a discrepancy between the two (US and imperial floz)...
1 imperial pint = 20 imperial oz = 19.2 US oz....
1 US pint = 16.65 imperial oz = 16 US oz...
It really doesn't seem a lot like that, but an imperial gallon = 160 imperial oz = 153.7 US oz. 7 oz different? That's nearly half a pint (in the US...) over a tankful you're getting a bit further out - give it 10 tanks for a longer term fuel efficiency calculation and you're well off.
The only thing is reliably consistent is the litre/liter, well, consistent except for the spelling of course.
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Canada is metric, so you can't buy "gallons" of fuel at the pump, only litres.
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Canada is metric, so you can't buy "gallons" of fuel at the pump, only litres.
You haven't been able to buy a gallon of fuel in the UK either for quite a few years now, you have to get 4.54 litres...
As far as I know, the 'historic' Canadian gallon was the imperial size rather than the US one. I'm more than happy to be 'corrected' on that.
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You still need to know just how big a US pint or gallon is before you can convert it to litres, though!
We need someone in the US to pump a 'gallon' into a fuel can then pour it into a litre calibrated fuel can and post the answer
Once we know how many litres you get, we can call the measurement any name we like, as we will have a fixed point to refer to :2thumbup:
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There are published standards you can look up.
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You still need to know just how big a US pint or gallon is before you can convert it to litres, though!
We need someone in the US to pump a 'gallon' into a fuel can then pour it into a litre calibrated fuel can and post the answer
Once we know how many litres you get, we can call the measurement any name we like, as we will have a fixed point to refer to :2thumbup:
3.78541 litres in a US gallon
0.473176 litres in a US pint
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1 U.S. gallon = 3.7853 liters = 0.83267 British gallons
1 British gallon = 1.2009 U.S. gallons = 4.546 liters
1 liter = 0.26418 U.S. gallons = 0.21998 British gallons
Doing the conversions, my K75RT gets approximately 46miles/U.S. gallon, 55.24miles/British gallon, 12.15miles/liter, and 19.55km/liter.
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If the world abolished the metric system and took up the SAE system we wouldn't have this problem would we?
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If the world abolished the metric system and took up the SAE system we wouldn't have this problem would we?
If they did that, none of our sockets or allen keys would fit classic BMW fasteners properly... And anyway, we'd lose all the fun of finding out whether some old piece of machinery uses SAE or W/W or BSP or BA (or another standard) fastenings and how many different standards are mixed :hehehe
Plus, being decimal based metric is easier. You don't fractionalise metric measurements, i.e. you don't state something is 1/12 of a metre - instead of dividing by 3 or 5 or 7 or 12 everything is 10s or multiples/divisions of.
Even though the UK is now predominantly metric, we still use miles. Fuel efficiency is still expressed in MPG (even though it's been 'illegal' to price fuel by the gallon at the pump for years), roadsigns still have miles on (except for approach to junctions etc., that's in metres..........). To be honest though, even the 'mile' is really a bit silly - how did a contraction of the word 'mille' (meaning 1000) come to express 1760 yards?
But even taking all that into account, I don't see a 'problem' - the volumes/measurements are known as are the relationships between the various systems. For most purposes an approximate conversion can be done quickly and simply in your head only requiring more complex calculations where precision is more important than speed.
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To be honest though, even the 'mile' is really a bit silly - how did a contraction of the word 'mille' (meaning 1000) come to express 1760 yards?
I believe it comes from the Romans. A mile is the distance a marching Roman soldier covered in 1000 paces. The average man moves forward a bit more than 5 feet every time he takes two steps.
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Metric is the best as stated above :neener:
We don't have metric litres and USA litres, for example, and we no longer need to know how to divide 19/75ths by 73/9786ths to get an exact measurement, we don't need tape measures with a thousand infinetly smaller marks on them...
NO! a millimetre is a pretty small enough measure for everday use, but a half millimetre is still easy to work with, then the sizes go up in tenths, nice and simple!
Also, to write a fraction in a numeric value is another set of numbers, eg 1/32 is also .03125" 15/32 is .46875" now at a glance, which is the biggest value?
OR.......say, 2mm or 5mm ? :hehehe
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That moment when you need that uncommon 25/32 socket, or the wrench set you just bought didn't include a 16 mm
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16mm is 5/8 :2thumbup:
I still need to use some imperial, I'm a Plumber, and all water pipe fixings are still measured in imperial, 1/2", inch n half, inch n a quarter, except copper pipe, which is usually 15mm, the old pipe was 1/2", but this equals 13mm.....old pipe was measured inside, new pipe is measured outside, then theres any lead pipe left, which is measured in pounds! 1/2 lb pipe, 3/4 pipe etc.....weight per foot, you needed to melt it to make joints as it could be any thickness/bore....thank the lord for Metric!
And we still measure doors as 78" x 30" etc, again just because we always have!
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43mpg on a recent tank but I ran it pretty hard.
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Fuelly said 42 mpg on an all highway, 80-85 mph run
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K1100RS
Worst - 48mpg
Best - 56mpg
Averaging 52mpg
(Imp)
All tanks measured after a mixture of about 60% open country lanes, 20% motorway and 20% town.
Riding style where possible is brisk, keeping an average motorway cruising speed of 80mph.
I'm very happy about that.
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I'm a lot of short tripping. I just changed out throttle bushings fixing some significant vacuum leaks and my MPG is getting better. Seems city I'm getting about 45-50 now. Will see with the next tank.
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I also changed those rubber bushings recently, and the fuel usage seems to have dropped somewhat since then to about .47 l/100km or pretty much 50 mpg (US mpg, I think that is...). Problem is, my speedo isn't quite stable so sometimes the odometer isn't really running, meaning I suppose the mpg could actually be even better for all I know.
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I recently did a short week long tour...lots of stopping/starting mixed with hiway miles.
Highest tank was 49, lowest 41 and average 44.
The last tank (the 41) was after a bout of HEAVY rain and I may have some water in my tank.
The reserve light was coming on at around 4 gallon used.
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Recently checked my mpg and it was around 47.
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On my K75s I have had up to 59mpg (UK)but on a run to Perth and back 180 miles or so as low as 50mpg but I was doing 90 on the way back, as I was on the dual carriageway , went there on the A93 ( Britain's highest road. However I have just re calibrated my speedo and expect the figures to change accordingly. As all the above figures really depend on speedometer accuracy, which is not a given, they are difficult to compare.
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all this talk about pints has made me thirsty :hehehe
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After 8000 miles tracking I get an average of 42 MPG (68 kms per galón)
Riding at 75mph = 49 MPG
Riding at 60mph = 63MPG ( did just once )
K1100RS