WJBertrand
Ventura Highway
Have you seen those mile marker signs? Also on a longer trip the total GPS odometer miles better match trip distances computed by Google maps, map quest and basecamp.Don in Lodi said:
-Jeff
Fuel Mileage
- Thread starter mrpete64
- Start date
-Jeff
Kurgan
Well-Known Member
Re: 46.17 miles per gallon...
I've compared miles driven per GPS vs. odometer, the bike odometer read 2.9% high on my 2013 as calculated after a 339 mile ride yesterday. Speedometer reads 6.2% high as well, not the best, but at least reasonably easy to fix with a Speedo Healer - set it so the odometer is accurate and if the speedo still reads 3% high, that's about par in my experience for most bikes.Cycledude said:
Threads merged here.
Guys, the problems with using a GPS as an odometer are very well documented.
It involves the way the GPS measures distance and the sampling jitter associated with a GPS. Computed GPS locations are not finely accurate to the foot - as you travel along, the computed position tends to jump around a bit and with a fine sampling interval, these small changes in position tend to add a consistent bias to make the GPS read higher than actual distance. Having the sampling intervals lengthened or using a smooth algorithm helps and is typically used, but if you're traveling a curvy route, this will then to "cut the corners" and under-estimate distance. And if you've ever used GPS for awhile, you're probably aware of momentary glitches where due to interference, poor satellite geometry, blockage of signal (bridges/tunnels), there is a relatively brief but large position error. Unfiltered, this adds huge miles you've never traveled. Again, smoothing algorithms can help damp this sort of thing, but they have their own issues.
An odometer measuring wheel revolutions has none of these errors. It may introduce its own consistent bias, but it won't generate weird and random errors like a GPS odometer will.
As far as the accuracy of the S10's odometer, it's been measured by many of us using the mile markers on interstate highways. It's reasonably accurate - within a percent or so - although use of non-standard tires can sometimes push things out further. As some have noted, an accurate odometer is inconsistent with the deliberate bias of the speedometer high but this is the way Yamaha (and most vehicle mfgs) design things due to certification regulations which require odometers to be very accurate but encourage speedometers to read on-average high so that the outlier never reads low. This results in a deliberate mis-match between the accuracy of the odo and speedo.
- Mark
It involves the way the GPS measures distance and the sampling jitter associated with a GPS. Computed GPS locations are not finely accurate to the foot - as you travel along, the computed position tends to jump around a bit and with a fine sampling interval, these small changes in position tend to add a consistent bias to make the GPS read higher than actual distance. Having the sampling intervals lengthened or using a smooth algorithm helps and is typically used, but if you're traveling a curvy route, this will then to "cut the corners" and under-estimate distance. And if you've ever used GPS for awhile, you're probably aware of momentary glitches where due to interference, poor satellite geometry, blockage of signal (bridges/tunnels), there is a relatively brief but large position error. Unfiltered, this adds huge miles you've never traveled. Again, smoothing algorithms can help damp this sort of thing, but they have their own issues.
An odometer measuring wheel revolutions has none of these errors. It may introduce its own consistent bias, but it won't generate weird and random errors like a GPS odometer will.
As far as the accuracy of the S10's odometer, it's been measured by many of us using the mile markers on interstate highways. It's reasonably accurate - within a percent or so - although use of non-standard tires can sometimes push things out further. As some have noted, an accurate odometer is inconsistent with the deliberate bias of the speedometer high but this is the way Yamaha (and most vehicle mfgs) design things due to certification regulations which require odometers to be very accurate but encourage speedometers to read on-average high so that the outlier never reads low. This results in a deliberate mis-match between the accuracy of the odo and speedo.
- Mark
WJBertrand
Ventura Highway
My GPS always returns fewer miles than the odometer and both are extremely consistent. There does not seem to be any random behavior at all. My route to work is 46 miles of more or less straight freeway. I get the same result every trip.
-Jeff
-Jeff
On my recent 550 mile trip I measured my ST speedometer as showing 65mph while the GPS indicated I was traveling at 63mph, or around 3% error.
The ST's computer fuel mileage was generally 1.5 MPG off my hand calculated mileage. On this trip I had a lot of 45-60mph roads, flat, and with little stop and go. I was hoping to hit mid to high 50s but the best she would do was 50.5 MPG. The bike has a top box but no side boxes.
The ST's computer fuel mileage was generally 1.5 MPG off my hand calculated mileage. On this trip I had a lot of 45-60mph roads, flat, and with little stop and go. I was hoping to hit mid to high 50s but the best she would do was 50.5 MPG. The bike has a top box but no side boxes.
[font=verdana, arial, helvetica, sans-serif]I've used the odometer, GPS, and mile markers set by the State. Your error is consistently what I have also gotten with the 2014 with the OEM Bridgestones. With the 2012 I would get 7-9%, depending on tires.[/font]Ron Earp said:
Ron Earp said:
Again, the amount of error in your fuel MPG shown is similar to what I get on the Gen2 bike with OEM tires, the MITAS tires are taller and slightly worse.
Getting max mpg is largely about holding making absolute minimal throttle changes, on a level road, and having that toward the bottom of the top gear which would be the speed range you mention. It also equates to the tires lasting longer.
Well, the exact same dead-straight route (probably with excellent satellite coverage) is the best conditions for the GPS and bike odometers to match.WJBertrand said:
- Mark
Forgot to mention I would short-shift, get the bike into 6th as quickly as possible and used the cruise control as much as humanly possible. Decent mileage, but was hoping it'd be better or at least best my non-cruise control Buell, although the Buell would have all three bags on and hit 55-56MPG at these speeds, sometimes a tad more while my ST currently only has a top box.
ST is a great machine though and gaas is cheap. Now, am I still going to say that about mileage when I put the side panniers on? Frontal area is going to go up quite a bit on the ST....
ST is a great machine though and gaas is cheap. Now, am I still going to say that about mileage when I put the side panniers on? Frontal area is going to go up quite a bit on the ST....
WJBertrand
Ventura Highway
Well, "dead straight" is not really correct, it's freeway for sure but 101 between Ventura and Goleta does have some curves and nearby hills/mountains. Then there's the couple of miles between the freeway and work and the freeway and home. I've seen the consistent behavior on other frequent trips though too. For example the ride up pacific coast highway (Hwy 1) from Ventura to Monterey that I make every year to attend the races at Laguna Seca. Hardly a straight mile!markjenn said:
Ron Earp said:
Fuel economy is on a U-shaped curve to speed in any gear. Too fast and of course the economy suffers, but lugging the engine can kill economy too. Here's a good reference form a BMW site:
http://bmwmotorcycletech.info/FuelMileage.htm
I just did a trip from PA to W. Virginia and the three full tanks of gas I got 50 ,40 and 45 mpg
I think MOST Yammi bikes are the worst in there class for MPG BUT that also comes with power!!
I get better mileage with my 07 Honda ST1300 and it's about 175 pounds heavier and much older
Tech.The Raider,Stratoliner,Warrior, 2nd gen FZ1 are some of the worst bikes ever made as far
As MPG . I use Lucas upper engine lube in my tank and get about 10% more MPG it was in the
Tank when I got the 50 MPG .
I think MOST Yammi bikes are the worst in there class for MPG BUT that also comes with power!!
I get better mileage with my 07 Honda ST1300 and it's about 175 pounds heavier and much older
Tech.The Raider,Stratoliner,Warrior, 2nd gen FZ1 are some of the worst bikes ever made as far
As MPG . I use Lucas upper engine lube in my tank and get about 10% more MPG it was in the
Tank when I got the 50 MPG .