Gas gauge sooooo inaccurate - Page 5 - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #41 of 93 (permalink) Old 07-23-2020, 09:56 AM
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Truthfully the difference between 40 and 50 mpg matters little to the pocketbook. That'd be 5 gallons over 1000 miles.

Personally, I'd be a lot more excited if I could improve my RVs mileage by 1 mpg than I would be the FJR. But somehow this speedometer error thread turned into a MPG thread, and I just had to relate my experiences.

Just keepin' up with traffic, Officer.

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post #42 of 93 (permalink) Old 07-23-2020, 10:10 AM Thread Starter
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I am still having trouble with the 50 mpg ( have you checked the accuracy of your Odometer??
I the insta millage calculator trying various gears and various peed I could get it to read 50 f I did 5 in 4th gear ..5 th lugged it which made the mileage drop
( Poor vacuum ) I used to hear mileage like that that on the PC 800 forum..and a few on the Bandit forum ..but alas I guess you right hand is just too heavy for such performance
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post #43 of 93 (permalink) Old 07-23-2020, 10:41 AM
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Originally Posted by Way8lifter View Post
I am still having trouble with the 50 mpg ( have you checked the accuracy of your Odometer??
I the insta millage calculator trying various gears and various peed I could get it to read 50 f I did 5 in 4th gear ..5 th lugged it which made the mileage drop
( Poor vacuum ) I used to hear mileage like that that on the PC 800 forum..and a few on the Bandit forum ..but alas I guess you right hand is just too heavy for such performance
Well, actually, yes. I always check a trip meter by the mile markers on new vehicles to see. Yes, I've made sure the trip meters track the odometer exactly. And no I didn't check the accuracy of the mile markers I have checked it in different places over different distances and am satisfied that my odometer is very close.

I can get current mpg up to 99.9 coasting down some of those long downhills in the Rockies or the Smokies. That's the limit on the read out; there's no telling how high it would really be. That's probably because the stock ECU turns fuel delivery almost completely off when coasting in gear. I need to check it now that I've got Ivan's flash.

I don't rely on the onboard computer. I actually log my odometer and fuel purchases and check mileage tank by tank. I have checked the onboard computer over several tanks, and even though it doesn't always agree with my calculations it averages out to be very close over several tanks. I suppose that's because I don't always fill exactly the same.

While lower RPM with a very light throttle may improve mileage, lugging it will not.

It's funny, but it seems like if I try to get good mileage in anything it gets worse. I do better just relaxing and enjoying the ride/drive. Slower speeds definitely help. A relaxed pace on crooked roads definitely helps. But trying to use lower throttle settings, lower RPM, etc. only hurts.

Just keepin' up with traffic, Officer.

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post #44 of 93 (permalink) Old 07-23-2020, 11:56 AM
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Well...... back in the old days, we hooked up a vacuum gauge which instantly tells you how heavy your foot is on the throttle... now they call it an ECO light on the dash.... no reason you couldn't hook up a vacuum gauge to the bike and see when you're "lugging" it, the effects of 4th vs. 5th, etc.
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post #45 of 93 (permalink) Old 07-23-2020, 05:03 PM
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Well...... back in the old days, we hooked up a vacuum gauge which instantly tells you how heavy your foot is on the throttle... now they call it an ECO light on the dash.... no reason you couldn't hook up a vacuum gauge to the bike and see when you're "lugging" it, the effects of 4th vs. 5th, etc.
The old vacuum gauge is a very poor man's excuse for the instantaneous mpg readout of today's vehicles. Going back to that would be like replacing your laser cutter with a sharp rock.

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post #46 of 93 (permalink) Old 07-23-2020, 11:39 PM
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True a vacuum gauge is a single input device, maybe not all fancy, but it works. If you have a Gen3, you can use the ECO indicator instead, but it flashes on or off at a tipping point, which you can use in combination with the "instantaneous fuel consumption" if you set your display to that. Compute accuracy over a few tanks and you're good to go.
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post #47 of 93 (permalink) Old 07-24-2020, 12:06 PM
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My 1965 Impalla SS had a big ass round vacuum gauge in the middle of the dash. You guys be bringing back some memories. I think of all the different vacuum gauges that I have used to synchronize carbs from the late 60's to now and the only one I now use is a Morgan Carbtune. Hope it works well for the FJR.
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post #48 of 93 (permalink) Old 07-24-2020, 06:44 PM
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Have to throw power/weight in there. If you get a Honda 250 single (fuel injected) which accelerates about like a Civic, you can get up into the 75 mpg range. If they made motorcycles focused on fuel efficiency, it would be pretty easy to break 100 mpg. And they'd sell like used toilet paper. Lol.
Hehehe. Keep in mind, motorcycles unfortunately lag several years behind cars/trucks. The cages are able to get the best of both worlds. Small engine with big torque + HP via use of hybrid and small turbo. That's how the Civic 1.5L is able to get over 200HP... yet still get low-mid thirties MPG. The same tech applied to the FJR, wouldn't need anywhere near 1.3L... which means you'd do a lot better than 40-50 MPG; while keeping the same or better performance levels...

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post #49 of 93 (permalink) Old 07-25-2020, 02:10 AM
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I consistently get between 43 and 48 mpg (45 mpg overall average) ... 44 at 115kph/70mph and more mpg at lower speeds. No complaints about that!

I've also learned that my low fuel warning light starts flashing at about 375km/230miles, at which point there are still 5 litres in the tank. All good.

My only gripe, and it's a tiny one, is that the "range" meter is not particularly useful, especially when it displays "Lo" ... that's essentially meaningless, but I understand it to mean "time to find a gas station!!!"
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post #50 of 93 (permalink) Old 07-25-2020, 02:41 AM
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Hehehe. Keep in mind, motorcycles unfortunately lag several years behind cars/trucks. The cages are able to get the best of both worlds. Small engine with big torque + HP via use of hybrid and small turbo. That's how the Civic 1.5L is able to get over 200HP... yet still get low-mid thirties MPG.
Not better, different. Not lagging, different objective. Huge shout out to the Honda S2000 which was the first naturally-aspirated car to reach 200 hp/L whereas 600 cc sportbike hit that mark routinely. Civic 1.5L turbo reaching 200 hp (133 hp/L) not very impressive in comparison to those 600s or to an R1 (1L) reaching ~160+ hp (160 hp/L) naturally-aspirated. Cars push towards fuel economy and are getting better about decent performance but very few reach the performance levels of motorcycles. And if they do, they are not 30-50 mpg cars.

Different markets, different objectives.

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