Miracle On GL1200 Gas Mileage - Steve Saunders Goldwing Forums

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post #1 of 13 (permalink) Old 10-02-2012, 06:19 PM Thread Starter
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Miracle On GL1200 Gas Mileage

OK Pros. Please give me your insight
About 8 or so months ago, my 87 1200 gas mileage suddenly dropped from 40 mpg to 34/35. I checked everything that was suggested but found nothing. Two weeks ago I filled up and it showed getting 39.6 mpg. I had already zeroed my odometer so thought surely that I had misread the mileage. I filled up again today and it showed I was getting 42.8. I am thrilled that it is back where it should be but have no idea why or what happened.

Any explanations from anyone?
Thank you,
ErnieB


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post #2 of 13 (permalink) Old 10-02-2012, 06:36 PM
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About twice a year the gas companies change the gas formulation from what they call a "winter" mix to a "summer" mix. That might be the problem right there if your bike is in good tune.. I'm not even gonna get into the octane discussion but I run premium in mine and have no problems with mileage, (42-45 average, 50.1 best [email protected] 65mph), or engine knock under load. To me, it's worth the extra few dollars...

Don

1985 Gl1200 Limited Edition
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post #3 of 13 (permalink) Old 10-03-2012, 09:07 PM Thread Starter
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Gas Mileage

Well, it just turned cool here so maybe they changed the mix at the gas pump I use.

ErnieB

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post #4 of 13 (permalink) Old 10-03-2012, 10:29 PM
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I don't have a clue but if it were me I'd go back and buy more of that gas.. Put it in cans... whatever it takes

John
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I have 2 other bikes. 2001 GL1800 and 2000 HD Dyna FXDX. Can you say MBS?:
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post #5 of 13 (permalink) Old 10-04-2012, 04:26 PM
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OK Pros. Please give me your insight
About 8 or so months ago, my 87 1200 gas mileage suddenly dropped from 40 mpg to 34/35. I checked everything that was suggested but found nothing. Two weeks ago I filled up and it showed getting 39.6 mpg. I had already zeroed my odometer so thought surely that I had misread the mileage. I filled up again today and it showed I was getting 42.8. I am thrilled that it is back where it should be but have no idea why or what happened.

Any explanations from anyone?
Thank you,
ErnieB
Have you changed brands of gas?
I notice a definite milage drop running sunoco, about 10 %, in my car and bike

84 interstate, would love a newer 1500
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post #6 of 13 (permalink) Old 10-04-2012, 06:55 PM
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Yes, it seems you are getting a great deal. I need some of that. lol

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post #7 of 13 (permalink) Old 10-04-2012, 08:11 PM
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You sure one of your buddys aren't removing and adding gas to mess with ya? Like mentioned before, they might be doing their summer/winter blend change over. I hate that winter stuff. All my vehicles get crappy mileage with it. I think it's another way for them to make more profits.

Paul
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Previous Bikes:
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post #8 of 13 (permalink) Old 10-06-2012, 06:52 PM
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I have bought gas at one place and get great gas milage and purchased it somewhere else and struggle to get 40 miles per gallon.I borred 5 gallons form my brother inlaw and he said it was only two weeks old the bike struggled to get 40 miles per gallon going home.I believe that the mixture ethynol in gas now starts breaking down and if it isn't fresh you pay for in gas milage the bike didn't miss a beat but didn't get good milage on several trips at times when I used gas from somewhere else.
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post #9 of 13 (permalink) Old 10-06-2012, 08:46 PM
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Gas mileage can be affected by temperature, humidity, wind, grade, altitude, driving style, tire air pressure, brake drag and on and on so we really have to look closely and carefully at what might cause an increase or decrease in gas mileage.


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post #10 of 13 (permalink) Old 10-06-2012, 10:21 PM
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Gas mileage can be affected by temperature, humidity, wind, grade, altitude, driving style, tire air pressure, brake drag and on and on so we really have to look closely and carefully at what might cause an increase or decrease in gas mileage.
All of what you say is true Vic but.... This gentleman has said that the drop was over a period of roughly 8 months AND he checked to see that the bike was in tune. This points to crappy gas as the main problem......

Don

1985 Gl1200 Limited Edition
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