MPG on a 78 wing.


Information and questions on GL1000 Goldwings (1975-1979)
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al56
Posts: 2
Joined: Wed May 05, 2010 7:49 am
Location: charles city iowa
Motorcycle: 1978 goldwin

MPG on a 78 wing.

Postby al56 » Tue Jun 16, 2015 4:45 pm



Just had the carbs rebuilt and now I am getting 12-15 mpg in town and 20-30 on the road. What kind of mileage should I be getting? The best I have gotten was 90 miles on a tank on the hwy.
Al



SnoBrdr
Posts: 325
Joined: Fri Mar 07, 2014 9:01 am
Location: Providence, Rhode Island
Motorcycle: 1978 GL 1000

129K Original Owner

Re: MPG on a 78 wing.

Postby SnoBrdr » Tue Jun 16, 2015 6:38 pm

al56 wrote:Just had the carbs rebuilt and now I am getting 12-15 mpg in town and 20-30 on the road. What kind of mileage should I be getting? The best I have gotten was 90 miles on a tank on the hwy.
Al


Best I've ever gotten, mostly around town is mid 20s.

35 or so on the highway.

Fuel gauge is useless and always has been.

The motor isn't really designed for around town, it's realy a 70 mph machine.

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Fred Camper
Posts: 1152
Joined: Sun Aug 16, 2009 9:15 pm
Location: Metro Detroit, MI
Motorcycle: 1977 GL1000, 1976 LTD GL1000

Re: MPG on a 78 wing.

Postby Fred Camper » Tue Jun 16, 2015 9:10 pm

My 77 has gone 195 miles on a tank, but that was deep into the reserve. Typically 160 miles per tank is fine. I do not live in a city so cannot speak to city miles, but around our suburb 30 plus is typical. On the road, I expect 40 to 45 most days unless the speed is above 65 mph. The trip odo is the fuel gauge as mentioned above.

al56
Posts: 2
Joined: Wed May 05, 2010 7:49 am
Location: charles city iowa
Motorcycle: 1978 goldwin

Re: MPG on a 78 wing.

Postby al56 » Tue Jun 16, 2015 9:39 pm

Thanks for the information. Looks like I need to run it until I hit reserve and then figure my mileage.
Al

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Ncscooter
Posts: 53
Joined: Wed Jun 17, 2015 11:20 am
Location: North Carolina
Motorcycle: 77 GL1000
76 CB400F

Re: MPG on a 78 wing.

Postby Ncscooter » Wed Jun 17, 2015 11:32 am

I'm new here, didn't see a welcome forum. I've had a 77 which I refurbished/reroaded for about 3 years now. I get right at or just below 30 around town and 35 on the highway. If you are truly getting 12 to 15, you might be missing a couple cylinders. Since you just had the carbs done, ignition would be the next thing I would check.

If there is an intro place, direct me to it. Nice looking forum. The Carolina Blue banner is very attractive! :D
Keep your expectations tiny and you won't end up so whiny.

sfruechte
Posts: 193
Joined: Tue Mar 09, 2010 12:53 pm
Location: La Crosse, WI
Motorcycle: 1977 GL1000

Re: MPG on a 78 wing.

Postby sfruechte » Thu Jul 02, 2015 4:30 pm

My 77 with 223,000 miles has averaged 45 mpg since new with highs in the 50's and lows in the 30's. Ethanol makes a significant difference and I have to try real hard to get 40 mpg with ethanol, 35 isn't uncommon. Ethanol can also attract moisture to your gas tank from the ambient air, even when full, it makes your engine work harder and burns drier than straight gasoline and it also gums things up faster in the carbs. I will drive further and pay more to get straight gasoline rather than use ethanol.

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wingman12
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Location: Land of Lincoln
Motorcycle: 1999 gl1500 se

Re: MPG on a 78 wing.

Postby wingman12 » Thu Jul 02, 2015 5:42 pm

If I was getting only 12 - 15 mpg after a carb rebuild, I would be back to that person and ask what did they not do correctly, you should be in the middle to upper 30's at minimum. You could have other issues beside the carbs, but that usually is the calibration of the carbs being off. You must have a trail of black smoke behind you? at least you are running rich not lean. :D :D

GLWingman
Posts: 2
Joined: Sat Jul 25, 2015 1:30 am
Location: Eagan, MN
Motorcycle: 1978 GL1000

Re: MPG on a 78 wing.

Postby GLWingman » Sat Jul 25, 2015 1:47 am

I haven't run my 78 empty yet, but I get around 120 miles per tank before the needle points to reserve and I stop to refuel.

One day I might carry a spare gas can and run it completely dry to see how far it goes.

Old Fogey
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Location: Glasgow Scotland
Motorcycle: 1976 GL1000
1979 GL1000
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Re: MPG on a 78 wing.

Postby Old Fogey » Sun Jul 26, 2015 9:38 am

wingman12 wrote:If I was getting only 12 - 15 mpg after a carb rebuild, I would be back to that person and ask what did they not do correctly, you should be in the middle to upper 30's at minimum. You could have other issues beside the carbs, but that usually is the calibration of the carbs being off. You must have a trail of black smoke behind you? at least you are running rich not lean. :D :D


+1! Take them back!
My engine is set up as a 76, which generally is more thirsty than the later engines, and I get around 40mpg/US gal cruising 50-60, and around 33-35 running 75-80.
Doug's bike Cyborg, with a 78 engine and carbs with 250K miles on it, gets about 4-5 mpg better than mine under the same conditions
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'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

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Solina Dave
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Location: Solina, Ontario, Canada
Motorcycle: 1978 Honda Goldwing GL1000 (bought in fall of '77)
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Re: MPG on a 78 wing.

Postby Solina Dave » Sun Jul 26, 2015 10:55 am

I agree with those who say, "take it back!" Mileage like that would seem unusually low, especially after recent carburetor work.
I keep an accurate record of every fill, and so far this season after 6500 kms./4039 mi., and 28 fills, my '78 Wing has averaged 50 mpg. on an Imp. gallon. That would be 42 mpg. on a U.S. gallon.
Probably 80%, of my relatively conservative riding, is done on secondary highways posted at 80 kph/50 mph., at speeds of 85-95 kph/53-60 mph. I usually use 4th gear at around 4000 rpm., and save 5th gear for highways with higher speed limits, to avoid lugging the engine.
I must admit that I never paid a lot of attention to the ethanol issue until you guys got me all stirred up about it, and this season I've made a point of filling with premium/ethanol free fuel at every opportunity. That would be 26 of the 28 fills this season. I've noticed approximately, a 3 or 4 mpg. improvement in gas mileage, since I've been using ethanol free fuel, so I guess that tells me something. One thing it tells me, is that the higher cost of premium fuel is offset, somewhat, buy the improved gas mileage.

Happy, and safe riding everybody...............................Dave
"Assume Nothing"

sfruechte
Posts: 193
Joined: Tue Mar 09, 2010 12:53 pm
Location: La Crosse, WI
Motorcycle: 1977 GL1000

Re: MPG on a 78 wing.

Postby sfruechte » Sun Jul 26, 2015 8:52 pm

My 77 has averaged 45 mpg over its 223,000 miles. As high as 55 and as low as 35 with gasohol. Gasohol is a terrible fuel, I avoid it whenever possible. It absorbs moisture from the ambient air, causes rust in your tank even if you store it full. It also contains less energy than gasoline, makes your engine work harder and burns drier also shortening engine life.




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