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Re:How FULL do you fill your tank & what kind of MPG?
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TOPIC: Re:How FULL do you fill your tank & what kind of MPG?
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How FULL do you fill your tank & what kind of MPG? 4 Months, 1 Week ago  
I've had my Roadie for just over a month and have gone through several tanks of fuel. Each time I fill the tank I wonder how full is full enough. With the bike on the stand there is still a pretty good void in the tank when the fuel hits the bottom of the filler spout sleeve. I've added up to .5 gallons more, trickling it in, because we take some long rides out in the desert (the last up into Death Valley) and every last drop may matter.

First question is whether there's an issue with filling it too much? At what point does the overflow or breather tube actually kick in, if any? Has anyone actually ever filled their tank right to the lid and if so did you have any issues?

The manual says 5.3 gallon capacity but is that completely full? I've put 4.3+ gallons in it more than once while running on reserve. It makes me wonder how much fuel I really had in the tank because more than once my fuel gauge has been pegged solidly on E shortly after the fuel light has come on. I'm interested more in range and reliability than I am in how much gas I can cram into the tank, not knowing exactly what's in there and what's left.

Having said that it's hard to check actual fuel mileage because it's impossible to know when the tank is actually full or whether I'm putting the same amount of fuel in as the previous tank, not getting an actual measurement of fuel consumption.

When riding solo before adding the bags I clocked 50 MPG with a near 250 mile range, but when 2-up it seems anything beyond 200 miles is pushing it.

What have you guys gotten? FYI I do have the hypercharger, pipes, and jetting so my mileage probably differs from most.
 
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Last Edit: 2017/08/08 13:23 By MidnightRide.
 
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#1019294
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Re:How FULL do you fill your tank & what kind of MPG? 4 Months, 1 Week ago  
I average 42-43 local riding. 46-48 2 up on longer rides.
You can take a center punch and put 3-4 holes in the neck near the top. I still leave a bit of vapor space especially if I'm going to park it real soon. If I'm on a trip then I'll fill it a little more.
 
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#1019302
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Re:How FULL do you fill your tank & what kind of MPG? 4 Months, 1 Week ago  
Well I typically fill to the bottom of the tube and then squeeze in just a touch more. I've got a FI bike so it only holds 4.76 US gallons according to the manual. Interesting idea of the vent holes to easily get more in there if you're on a ride.

I too wanted to ask about mileage. I've only had this bike since June (close to 2K miles now) and I've been getting 34-36 MPG with it. Much of my driving has been combination of highway and town driving back and forth to work. A few trips with highway miles. From what others have posted I kind of thought I might get slightly better mileage. I don't baby it but I don't jump on the throttle hard at every opportunity either.

Be interest to see what others say.
 
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#1019304
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Re:How FULL do you fill your tank & what kind of MPG? 4 Months, 1 Week ago  
With my FI, I squeeze in as much as I can. Don't use the tank capacity to calculate mileage. Use your gas receipt.
 
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#1019306
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Re:How FULL do you fill your tank & what kind of MPG? 4 Months, 1 Week ago  
brad_g wrote:
Well I typically fill to the bottom of the tube and then squeeze in just a touch more. I've got a FI bike so it only holds 4.76 US gallons according to the manual. Interesting idea of the vent holes to easily get more in there if you're on a ride.

I too wanted to ask about mileage. I've only had this bike since June (close to 2K miles now) and I've been getting 34-36 MPG with it. Much of my driving has been combination of highway and town driving back and forth to work. A few trips with highway miles. From what others have posted I kind of thought I might get slightly better mileage. I don't baby it but I don't jump on the throttle hard at every opportunity either.

Be interest to see what others say.


Well most of my rides are open highway so that's the only MPG number that I care about for me, simply so I can calculate a range in advance of the ride. We have to make strategic fuel stops when heading out into the no-man's-land of remote desert Nevada.

On the first ride after buying the bike I ran down to Kingman, AZ and logged just about 100 miles. I filled the tank to check the mileage and added two gallons exactly. On the way back it seemed to use about the same amount of fuel but I didn't refill it to check. And because I was testing the bike on the highway for the first time I was running in excess of 80 MPH for much of the trip with a short jaunt or two up over 100 MPH just to check it out. Yes, the bike will do over 100 LOL. Don't tell anyone... My last bike would do nearly 180 MPH so this one's pretty tame hehehe.

So I wasn't exactly trying to scrimp on fuel.

And I DO enjoy gassing it away from stop lights to put some space between us and traffic behind, but on the open road I'm pretty much lugging the motor to maximize fuel mileage when practical. Once we're out of town it's open cruising ad-infinitum.
 
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#1019307
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Re:How FULL do you fill your tank & what kind of MPG? 4 Months, 1 Week ago  
I fill to the bottom of the neck and then squeeze just a little more in. As for mileage, when I ride with a group or on the hwy I get 45 to 48, when I ride alone I get 36 to 42, I always fill it the same and I figure off the receipt like Shores does.
 
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#1019308
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Re:How FULL do you fill your tank & what kind of MPG? 4 Months, 1 Week ago  
Firedog wrote:
I average 42-43 local riding. 46-48 2 up on longer rides.
You can take a center punch and put 3-4 holes in the neck near the top. I still leave a bit of vapor space especially if I'm going to park it real soon. If I'm on a trip then I'll fill it a little more.


This is a good idea, punching holes in the neck. Apparently it's strong enough to handle the impact? Also, any concerns about the need for a brass punch to avoid a spark? I'd be tempted to drill rather than punch if not for concerns about shavings in the tank. I'd think that even a single hole would be effective.

Not sure I'd want to drain and dry out the tank but possibly a good choice. Even running the tank low and filling the gap with a rag, not allowing it to touch fuel, would be a good choice. The former firefighter in me is always thinking about disasters, LOL.

I'm thinking about punching a hole(s) and then scribing a line on the filler neck that I can use for reference when filling the tank. That'll allow me an accurate check of mileage. And yes, I always go by the gallons put into the tank, not the tank capacity, when checking mileage.

My question about capacity was really just regarding where that 5.3 gallon capacity was measured from by Yamaha, the bottom of the neck sleeve or when the tank is filled to the rim of the cap opening itself?

And also, does anyone know of any kind of fuel overflow canister, such as a car would have, that an overfill of fuel would be flowing into without our knowledge? When I pulled the tank off I only saw two types of outlets, the vapor tube that runs out of the bottom of the tank and some kind of tube that sticks out of the top front of the tank under the gauge panel. I've never seen fuel running out of anything after filling it high.
 
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Last Edit: 2017/08/08 15:20 By MidnightRide.
 
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#1019309
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Re:How FULL do you fill your tank & what kind of MPG? 4 Months, 1 Week ago  
Driving conservatively. Under 75. Maybe one cold start, I can easily get the mid 40's.
Stop and go-go. Several cold starts. Running 85 plus on the highway, I can get into the mid 20's.

4.3 at the light, is pretty typical. Don't depend on it. The top half of the gauge gives more miles then the bottom half.
Like the others, just inside the bottom of the neck is fine. Resist the temptation to stand the bike up and trickle in as much fuel as will fit. Especially, if you're going to park it in the sun.
 
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#1019310
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Re:How FULL do you fill your tank & what kind of MPG? 4 Months, 1 Week ago  
That's not a vapor tube on the bottom. That's the petcock the fuel flows out of. The one on the upper corner is the tank vent. The only overflow, is the ground around the bike. If you put to much in, and it expands from heat, it'll end up on the ground.
 
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#1019311
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Re:How FULL do you fill your tank & what kind of MPG? 4 Months, 1 Week ago  
SKWEARpeg wrote:
That's not a vapor tube on the bottom. That's the petcock the fuel flows out of. The one on the upper corner is the tank vent. The only overflow, is the ground around the bike. If you put to much in, and it expands from heat, it'll end up on the ground.

By the 'bottom' I wasn't referring to the petcock. Better stated would have been 'underside', the long rubber tube that connects in the middle underside of the tank, above the frame tube itself.

The other is on the front of the tank. I may pull the tank off again to check the plugs and if I do I'll post a couple of pics now that I've got the RSC photo posting thing figured out.

First I'll have to run some of the fuel out of it, a good excuse for another ride...
 
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Last Edit: 2017/08/08 19:37 By MidnightRide.
 
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