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Discussion Starter · #1 ·
Hi all

I have a 86 Interstate and have noticed a dramatic increase in fuel comsuption over the last couple of weeks, I have recently had it serviced but they said they couldn't find anything wrong, has anybody come across this before

regards

Graham
 

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What mpg change exactly. It could be something as simple as a higher ethanol content in the fuel you bought, especially if you don't go to the same brand gasoline station. I always notice a drop in mileage when visiting my sister in Reno (uphill) and going home (downhill).
 

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Discussion Starter · #3 ·
No change in the fuel, as its from the same station, increased by approx 20-30% :(
 

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Some thoughts/questions:

Has the weather been cooler lately. MPG drops when temps drop.

You said you had the bike serviced. What did they do? Anything tune-up or engine related. Change of oil?
 

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If there was one thing that was very consistant on my 1200, it was mileage. I'd check plugs, plug wires and end caps, and then carbs. If the bike is overfueling it will run rough, belch some black exhaust smoke, and the plugs will likely foul. How long have you noticed the change? If it's only a couple tankfulls, I'd blame the fuel, it's happened to me before. Once the crappy petrol is done, back to better mileage
 

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Winter blend will make a difference, also did you check more than 1 tank?
 

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Discussion Starter · #7 ·
Thanks guys for the feedback, it has been a little cold here for the last few weeks 2 degrees on average, I have only run a couple of tanks through, so for the moment I might change petrol stations to see if that makes any difference, if not I'll go back to my garage and get thme to give it another once over to see if they come up with something they might have missed on the service.

Once again thanks, great feedback
 
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