Miles on a Full Tank? - Page 2 - Suzuki Burgman Forum
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post #11 of 49 (permalink) Old 11-15-2016, 12:28 PM
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Although not recommended, I deliberately ran the tank empty exactly one time, while carrying a gallon of gas on board, to see how much usable gas I really had. The tank does, indeed, take 3.6 gallons. I almost always have a GPS on board, and reset one tripometer with every fill-up. Multiple measurements show that the odometer is about 4% high, although the speedometer is about 10% high.

By strange coincidence, the MPG reading is about 4-5% LOW compared to usual actual gasoline used for INDICATED mileage. However, if I adjust the INDICATED mileage to what my GPS says is the ACTUAL mileage, then the MPG readout is about right! I think it's all entirely coincidental (although I cannot understand why the MPG reading does not sync to indicated mileage), but the bottom line is that MPG reading turns out to be about right if you're using GPS mileage. Strange, indeed.

I've been measuring my MPG cumulatively since the beginning of 2016 (about 7,500 miles ago) and am averaging about 62 MPG using actual fuel and indicated mileage. Adjusting the mileage reading for the 4% error, I've been getting about 59.5 MPG ACTUAL.

So what does this all mean for range? If I'm doing my average riding (which excludes extended expressway speeds), then I can expect about 225 INDICATED miles of maximum range. I make sure to buy gas no later than 200 after I've filled last time because I don't want to run the tank dry again.

For reference, I'm 165 lbs. and keep the rear tire at 30-32 psi most of the time.

And, yes, I'm retired. Who else would have the time or inclination to do all this obsessive measuring?

Some people are like slinkies. They're not very interesting, but they bring a smile to your face when you push them down the stairs.

1977 Cimatti City Bike
2003 Tomos A35 (65cc)
1999 Tomos LX Classic (65cc)
2006 TGB Laser R5
2010 SYM Symba ("Yogi")
2009 Genuine Buddy 125 ("Boo Boo")
2009 Genuine Buddy 150 Blackjack ("Jill")
2003 Honda Reflex
2013 Suzuki Burgman 400 ABS ("Ingrid")
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post #12 of 49 (permalink) Old 11-15-2016, 02:54 PM
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Getting 60mpg on a 400cc engine was impossible 20 years ago. Back then a 250cc would do good to get 60mpg.

I think that the introduction of 4 valves on a single cylinder spinning an undersquare piston at high rpm, along with fuel injection made all the difference. Things we now take for granted.
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post #13 of 49 (permalink) Old 11-15-2016, 08:19 PM
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dogboy, I've done the same type of calculations (GPS vs indicated) on my 2013 400 and have come to practically the same conclusions you have regarding speedometer/odometer/trip meter/mpg errors.
I've averaged 58.8 mpg (indicated miles) over 2000 miles. All of my riding is done two up.
Yes, I'm retired too.
I usually start looking for gas when the trip meter shows around 200 miles. At 200 miles it takes 3.2 - 3.3 gallons of gas.
Question... when you ran your tank dry and it took 3.6 gallons to fill up... where did you fill to? I always fill mine up to the bottom of the filler tube that sticks down into the tank (with the bike on the center stand... and not shaking it to get more in). The most I ever put in mine was 3.3 gallons. I've always wondered how much was still left in the tank (usable)... but never tried actually running it dry.
Thanks,
Greg
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post #14 of 49 (permalink) Old 11-15-2016, 09:39 PM Thread Starter
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Refill when the 200 mile is reached.

I am a bit hesitant doing that with an used Burg that I just got a few days ago. I would need to have the Burg checked out and create a bond with it.

But I would wait until the needle reaches the red section and then refill right there. I plan on taking the fuel tank out and clean it inside out when I have the Burg checked out.

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post #15 of 49 (permalink) Old 11-15-2016, 10:23 PM
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Quote:
Originally Posted by gjklockhart View Post
Question... when you ran your tank dry and it took 3.6 gallons to fill up... where did you fill to? I always fill mine up to the bottom of the filler tube that sticks down into the tank (with the bike on the center stand... and not shaking it to get more in). The most I ever put in mine was 3.3 gallons. I've always wondered how much was still left in the tank (usable)... but never tried actually running it dry.
Thanks,
Greg
I wanted to do the fill-up the way I always do, to make it useful to me. She was on the side stand, no shaking action, and I added gas until it was somewhere in the filler tube, although not probably not to the very top.I figure there's only 6 or 8 ounces between one end of the filler tube and the other (0.05 of a gallon?) so I question how much difference it would make, anyway. When I ran dry, I added the one gallon I had on-board, and then had to drive a relatively short distance to top off the tank. I did some math at the time, adjusting for the gas used between running dry and the fill-up, and came up with 3.6 gallons useful capacity. I don't remember exactly, but it seems to me that I had gone about 225 miles indicated when Ingrid ground to a halt.

Unless I've been running at expressway speeds for a large percentage of the tank, I figure I'm good for 200 indicated miles and still have a little safety margin.
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Some people are like slinkies. They're not very interesting, but they bring a smile to your face when you push them down the stairs.

1977 Cimatti City Bike
2003 Tomos A35 (65cc)
1999 Tomos LX Classic (65cc)
2006 TGB Laser R5
2010 SYM Symba ("Yogi")
2009 Genuine Buddy 125 ("Boo Boo")
2009 Genuine Buddy 150 Blackjack ("Jill")
2003 Honda Reflex
2013 Suzuki Burgman 400 ABS ("Ingrid")
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post #16 of 49 (permalink) Old 11-15-2016, 10:54 PM
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I don't remember exactly, but it seems to me that I had gone about 225 miles indicated when Ingrid ground to a halt.
LMAO ... love the name of your bike. I will have to ponder the spirit of my machine and come up with an appropriate name. Though, your choice is pretty hard to top.

Let me ride 'til I croak.
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post #17 of 49 (permalink) Old 11-16-2016, 01:03 AM
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LMAO ... love the name of your bike. I will have to ponder the spirit of my machine and come up with an appropriate name. Though, your choice is pretty hard to top.
Ingrid? Of course it would be Ingrid... What else would any red-blooded American male (or Scandinavian) over the age of 50 name their Burgman? "Here's looking at you kid..." Lol.

"What is your measure of success? Warren Buffett has always said the measure is whether the people close to you are happy and love you." Bill Gates

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Ingrid - '07 Blue Burgman 400 (56k mi) - original owner
Jesse - '05 Silver Burgman 650 (27k mi) - 3rd owner

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post #18 of 49 (permalink) Old 11-16-2016, 06:54 AM
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Dogboy nailed it. The fuel gauge is so far off it keeps you from running out but there is plenty left when it shows empty.
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post #19 of 49 (permalink) Old 11-16-2016, 08:49 AM
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Dogboy nailed it. The fuel gauge is so far off it keeps you from running out but there is plenty left when it shows empty.
Yup, there's something Like 50 miles left in the tank when it first indicates empty. I think Suki did it because there is no reserve tank, nor flashing fuel pump icon like on the 650 to indicate you're getting low.

Personally, I use the tripometer exclusively. When it's gets over 180 miles, time to start looking.
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Jesse - '05 Silver Burgman 650 (27k mi) - 3rd owner
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post #20 of 49 (permalink) Old 11-16-2016, 09:19 AM
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The fuel gauge on my Genuine Buddy 125 is even more annoying. By the time the needle gets to the 3/4 mark, it's already used about half its fuel and then it stops to drop alarming quickly. But when the gauge gets to the very bottom and rests against the "E" pin, even though I know there are at least 25 miles left in the tank it gets REALLY unnerving to keep riding like that. Last week I had forgotten how quickly the gauge drops once it reaches the halfway mark and I found myself out in the middle of nowhere with the needle buried against the empty pin. I was in a near-panic, especially when the gas station I was planning to use was CLOSED. I cruised along in the shoulder of a 50 MPH road (no, not legal with 125cc) at 30 MPH trying to use as little gas as possible and hoping that I wouldn't have to push "Boo Boo" too far once she ran dry.

Well, I made it to the next gas station and she still had 0.2 useful gallons in her, which equates to about 20 miles (100 mpg on average). In the back of my mind I suspected I had the range, but the visual cues were stress inducing, indeed, especially because she doesn't have a trip odometer.

Some people are like slinkies. They're not very interesting, but they bring a smile to your face when you push them down the stairs.

1977 Cimatti City Bike
2003 Tomos A35 (65cc)
1999 Tomos LX Classic (65cc)
2006 TGB Laser R5
2010 SYM Symba ("Yogi")
2009 Genuine Buddy 125 ("Boo Boo")
2009 Genuine Buddy 150 Blackjack ("Jill")
2003 Honda Reflex
2013 Suzuki Burgman 400 ABS ("Ingrid")
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