Gas Mileage?


Information and questions on GL1100 Goldwings (1980-1983)
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FallenHeavens
Posts: 17
Joined: Mon May 05, 2014 6:11 pm
Location: Visalia, CA
Motorcycle: 1983 GL1100 Aspencade

Gas Mileage?

Postby FallenHeavens » Wed Jun 18, 2014 2:17 am



What kind of gas mileage are you all getting on your bikes? My first fill-up went down from full to 1/4th tank after just 86 miles, and I calculated out roughly 26 miles per gallon from that, which I feel is pretty low [maybe I'm just expecting too much coming from an old Ninja 250].

What mileage figures are you guys and gals seeing?
What tips do you have for raising my mileage [I mean changes to the bike, not driving practices]?



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Overdog
Posts: 173
Joined: Sat Oct 12, 2013 7:00 am
Location: Pittsburgh, Pennsylvania
Motorcycle: 83 Goldwing Interstate

74 BMW R90/6

Re: Gas Mileage?

Postby Overdog » Wed Jun 18, 2014 4:23 am

I'm getting 38---39 MPG out of my 83 interstate...that's mixed riding, a 10 mile commute to work and a bit of highway on weekends. One of the things I really miss about my old BMW was 45---48 MPG and a 6.3 gallon tank.

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WingAdmin
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Posts: 17050
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Gas Mileage?

Postby WingAdmin » Wed Jun 18, 2014 8:22 am

I would regularly get 40-45 mpg out of my GL1100. 26 mpg is definitely way too low - you're either screaming up hills in low gear and wide open throttle and/or drag racing, or you've got a carburetor issue where it's running too rich.

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FlashBack
Posts: 115
Joined: Tue Apr 09, 2013 8:56 pm
Location: Cheshire, Oregon
Motorcycle: 1983 Honda GL1100 Interstate

Re: Gas Mileage?

Postby FlashBack » Wed Jun 18, 2014 12:14 pm

I am averaging 42-46 miles per gallon on my 83 GL1100i

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Wilcoy02
Posts: 726
Joined: Sun Nov 21, 2010 11:37 pm
Location: Marengo, Ohio
Motorcycle: 1983 GL1100 I purchased 3/16

1983 GL1100I frame with an 80 engine. poor boy installed with C-5 ignition--DIED in Grande Prairie Alberta Canada 8/15


98 valkyrie sold 8/16

Re: Gas Mileage?

Postby Wilcoy02 » Wed Jun 18, 2014 6:42 pm

I get 38 without atf and 40-42 with 6-8 oz of atf in the tank. I ride a 83 gl1100 with the c-5 ignition.

FallenHeavens
Posts: 17
Joined: Mon May 05, 2014 6:11 pm
Location: Visalia, CA
Motorcycle: 1983 GL1100 Aspencade

Re: Gas Mileage?

Postby FallenHeavens » Thu Jun 19, 2014 1:36 am

I would assume that it's a bad sync with my carbs causing the gas mileage to be pretty low, but this current tank [just my second fill-up since I got it back on the road] is a little above half with about 70 miles on it. I haven't changed anything with the bike since the last fill-up so I'm really not sure what the issue is. I'll have to follow the DIY carb sync guide on the site and see what changes I get, but with how money has been going lately that might be a couple weeks or more out.

How can I check to see if that's the issue without buying gauges or anything like that?

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WingAdmin
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Posts: 17050
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Gas Mileage?

Postby WingAdmin » Thu Jun 19, 2014 9:45 am

If your carb sync is out so much that it's causing mileage problems, the bike will be running very rough at idle, and will chatter and vibrate when accelerating at low speeds.

I would concentrate on something that could cause the bike to use too much fuel - like a stuck float. Whichever cylinder is responsible will be running extremely rich. I would pull the spark plugs and have a look at them. Check to see if any of them is coated with a dry, black, sooty coating. If you find one, that's your culprit. Have a look at How to "read" used spark plugs

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russ71
Posts: 38
Joined: Sat Jan 08, 2011 12:33 am
Location: Springfield
Motorcycle: 1982 GL1100 A Aspencade

Re: Gas Mileage?

Postby russ71 » Sun Jun 22, 2014 8:41 am

I had the same problem. See if your carbs are synced. Im now getting 38-40 mgg on my 82 GL1100 Aspencade

FallenHeavens
Posts: 17
Joined: Mon May 05, 2014 6:11 pm
Location: Visalia, CA
Motorcycle: 1983 GL1100 Aspencade

Re: Gas Mileage?

Postby FallenHeavens » Sun Jun 22, 2014 12:12 pm

WingAdmin wrote:If your carb sync is out so much that it's causing mileage problems, the bike will be running very rough at idle, and will chatter and vibrate when accelerating at low speeds.


So this is pretty accurate to what I'm experiencing. Around 800-1000 RPMs my bike sounds like it's trying to replicate the idle of a Harley-Davidson, and if I just try to accelerate straight from the idle [rather than prepping the bike to about 2k rpm and letting the clutch out slowly] it has a hard rumble, almost like an engine knock. I'll be going to get the hardware necessary to syncing my carbs soon, and I've read the DIY guide before; are there any other words of caution or tips you ladies and gents can give me before I get into it? I can typically figure out mechanical things myself fairly easy, but I always appreciate advice from those who have experience.

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patbrandon1
Posts: 442
Joined: Mon Mar 26, 2012 1:39 am
Location: Bay City, Michigan
Motorcycle: 1982 GL1100 I
1981 Honda CM400C

Re: Gas Mileage?

Postby patbrandon1 » Sun Jun 22, 2014 4:09 pm

FallenHeavens wrote:What kind of gas mileage are you all getting on your bikes? My first fill-up went down from full to 1/4th tank after just 86 miles, and I calculated out roughly 26 miles per gallon from that, which I feel is pretty low [maybe I'm just expecting too much coming from an old Ninja 250].

What mileage figures are you guys and gals seeing?
What tips do you have for raising my mileage [I mean changes to the bike, not driving practices]?


I get about 38-40 MPG with my '82 Interstate depending how I ride. How long have you had the bike? Did you ever run a course or two of Seafoam through the gas? That does help clean out the carbs some.

If memory serves me right, there is a five gallon gas tank on your Wing. Four of those gallons are with the gas shutoff valve, (petcock) in the on position, and one gallon is for reserve. Gas gauges aren't always accurate, ...

To get an accurate reading of your millage, fill the tank full, zero out your trip meter, ride it until you have to switch it to reserve, then divide the mileage on the trip meter by four, and you will get a pretty accurate reading. To be sure you used four gallons, as soon as possible, get to a gas station and fill up, and it should take pretty close to four gallons. If not, simply adjust your division accordingly.

I try to go with the easiest solutions first. It can't hurt to get another reading, and you get to ride while doing so. But while you are riding, get some Seafoam into the full tank of gas, maybe even a half a bottle of it. Keep us posted, and ride safe. Welcome to the forum.

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WingAdmin
Site Admin
Posts: 17050
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Gas Mileage?

Postby WingAdmin » Mon Jun 23, 2014 12:30 pm

FallenHeavens wrote:
WingAdmin wrote:If your carb sync is out so much that it's causing mileage problems, the bike will be running very rough at idle, and will chatter and vibrate when accelerating at low speeds.


So this is pretty accurate to what I'm experiencing. Around 800-1000 RPMs my bike sounds like it's trying to replicate the idle of a Harley-Davidson, and if I just try to accelerate straight from the idle [rather than prepping the bike to about 2k rpm and letting the clutch out slowly] it has a hard rumble, almost like an engine knock. I'll be going to get the hardware necessary to syncing my carbs soon, and I've read the DIY guide before; are there any other words of caution or tips you ladies and gents can give me before I get into it? I can typically figure out mechanical things myself fairly easy, but I always appreciate advice from those who have experience.


You could also have a restriction in one carb that is causing one cylinder to run poorly (or not at all). When the bike is cold, start it up, let it idle, and feel the exhaust runners to see if they are heating up evenly.

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Britanicus
Posts: 142
Joined: Thu Aug 12, 2010 12:38 pm
Location: Cambridge, Ontario, Canada
Motorcycle: 1982 GL1100 GoldWing

Re: Gas Mileage?

Postby Britanicus » Mon Jun 23, 2014 11:37 pm

my math sucks,

I get about 55KM per gallon or about 220km until I hit the res.

Seems bad to me but it is hard to figure Canadian gpm and then convert to litres per KM

LOL,
I figure it must be about 36-39 mpg. But I also have a bad muffler so I am not getting teh back pressure either.

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280shooter
Posts: 3
Joined: Fri Sep 07, 2012 3:35 pm
Location: Boise, Idaho
Motorcycle: 1982 GL1100A Aspencade

Re: Gas Mileage?

Postby 280shooter » Fri Jul 04, 2014 11:21 pm

39-40 on my '82. The lowest was 33 for a tank last year heading back from Yellowstone while fighting a nasty storm. HEAVY headwind.

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Wingsconsin
Posts: 787
Joined: Tue Jul 10, 2012 1:47 pm
Location: Sussex, Wisconsin (West of Milwaukee)
Motorcycle: 2002 GL1800 - Pearl Orange
1996 GL1500 Aspencade - Pearl Blue
1992 GL1500 Aspencade -Candy Red
1983 Suzuki GS850GL - Blue & Black
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Re: Gas Mileage?

Postby Wingsconsin » Mon Jul 07, 2014 4:27 pm

Carb synch is helpful - but mostly at low speed and idle..
Once we got the carbs synched perfectly ( a process that took time and patience) the fuel economy went up by nearly 10%.
Average MPG on the 1980 was always between 38MPG on the highway at 70+MPH to mid 40's
Here's how it started and sounded AFTER the carbs where finally matched properly..

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