Quick question: fuel economy - BMW Luxury Touring Community
 
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post #1 of 9 Old Nov 25th, 2014, 8:35 am Thread Starter
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Quick question: fuel economy

2006LT, 58,000 miles. Air filter and fuel filter 2 years old. 24,000 on the plugs.
For the past few years 44-45mpg.
Noticed a slight decline in economy over the last year to the 41-42 range.
Just got back for a 600 mile ride in the rain at 75mph moving average, and running on 90 octane fuel, which was all that's available on the route I took.
Mileage 30 to 34mpg. No pinging but slight reduction in engine performance.

I'm thinking fuel and air filters primarily and octane rating secondarily.
Bike is on the lift for valves , plugs and filters. Anything else come to mind that mpg reduction might point to?

BTW, the Metzelers grip rain slick roads like a terrified cat.
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post #2 of 9 Old Nov 25th, 2014, 10:46 am
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Re: Quick question: fuel economy

Normally with a drop like that I would suspect the O2 sensor. But you were on a high speed trip and if there were head winds it could cause a drop like that. If it remains low (in the low 30's) I would change it.

I get 41-45 normally but pulling a trailer in head winds @80 will drop it to 28.

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post #3 of 9 Old Nov 25th, 2014, 12:02 pm
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Re: Quick question: fuel economy

Quote:
Originally Posted by jzeiler View Post
Normally with a drop like that I would suspect the O2 sensor. But you were on a high speed trip and if there were head winds it could cause a drop like that. If it remains low (in the low 30's) I would change it.

I get 41-45 normally but pulling a trailer in head winds @80 will drop it to 28.
Speed, wind & especially rain = low fuel mileage. Pushing the bike through rain at interstate speeds I have got mid 30's for mpg many times.

Dave Selvig
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post #4 of 9 Old Nov 26th, 2014, 5:27 pm
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Re: Quick question: fuel economy

Also noted that when riding in the rain, fuel mileage drops dramatically. So does riding 2 up at 100+ mph for that matter.

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post #5 of 9 Old Nov 26th, 2014, 5:56 pm
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Re: Quick question: fuel economy

And depending on the state you fuel up in, alcohol up to 10 percent does not have to be indicated on the pump. That 10 percent will usually cost you 5 percent or more in mileage as will any decrease in altitude, but not to the same degree. All that and you're probably using winter blend by now. That hurts it too.


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post #6 of 9 Old Nov 26th, 2014, 6:09 pm
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Re: Quick question: fuel economy

when im on the road, only me with my gear, i expect 50+ mpg, computer shows 45, around town and comuting 40-45.

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post #7 of 9 Old Nov 27th, 2014, 1:38 pm Thread Starter
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Re: Quick question: fuel economy

New plugs installed this afternoon.
Thus far nothing looks abnormal. Air and fuel filters tomorrow, along with valve check just because it's in pieces and I'm on vacation.

About 24-25k on these Bosch plugs. I did notice that the old plugs were just beyond finger tight, so I think maybe I'm getting some bleed by from these.





Replaced with these NGK items

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post #8 of 9 Old Dec 3rd, 2014, 9:56 am
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Re: Quick question: fuel economy

I would do the 0/2 sensor. You can buy it online
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post #9 of 9 Old Dec 3rd, 2014, 1:18 pm
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Re: Quick question: fuel economy

I have seen the same drop in mileage from what I suspect was bad gas. Filled up in MS and I'm getting low 30's when I normally get 44. Stopped before I got home and got some gas in AL and it went right back up to 44. Winter months drop my ave. to 41.

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