Big difference in MPG with temperature. - BMW Luxury Touring Community
 
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post #1 of 18 Old Nov 29th, 2005, 9:40 am Thread Starter
 
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Big difference in MPG with temperature.

When I purchased my bike in Florida I was rewarded with a 52 MPG 1,100 mile trip home. Lately though, it seems my mileage has been suffering. One night driving home in 27 degree temperature I was getting 34 MPG, very disappointing. I thought maybe it was a dirty air filter, etc.
Yesterday while driving to work in 68 degree heat (weird for NJ autumn) the bike was getting 48 mpg, WOW! That's the best it's been in a while. Now, later on that evening when the temps dropped to 53, the mileage dropped to 44-42.
The bike has received a canisterectomy from the previous owner, and the bike still has >5000 miles. I have not done any oil or filter maint since I have owned it.
Does this bike vary that greatly with temp or can I be experiencing something different?
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post #2 of 18 Old Nov 29th, 2005, 9:55 am
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I haven't noticed changes in my mileage being related to temp as much as the style of riding I'm using. Certainly running an honest 75-80 drops my average to about 42 or so while staying in the 55-70 range kicks it up to 45 or better. Head winds (typical of winter riding) always reduce the economy. I have had days when mileage was in the 50's but most of those were in the high country and pretty leisurely. I've also had head winds going south from the Dakotas into Kansas that dropped me into the mid-30s. Ouch.

Edgar Tanner
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post #3 of 18 Old Nov 29th, 2005, 10:04 am Thread Starter
 
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At 1st I thought it was the different windshield (a CB), but with the increased mileage I have ruled that out.
The weather although varied in temp hasn't been any different wind wise. And, I pretty much stay the same route on my daily work transit. I don't do much wet weather riding unless I'm caught short.
I fuel at the same place, and don't hotdog around much. Just can't figure it.
Ed
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post #4 of 18 Old Nov 29th, 2005, 10:05 am
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My fuel milage has decreased recently as well. I had been blaming it on the cold weather. But the more I think about it, I think it is related to my changing the throttle cables to the 2005 type. I have found that I throttle it up more upon taking off because it is sooo much less stiff.

Steve
2005 K1200LT
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post #5 of 18 Old Nov 29th, 2005, 10:18 am
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The mileage does vary with temperature. I commute the same route year round.
Deg. F mpg
70-100 43-45
50-70 40-43
40-50 36-38
30-40 34-38
20-30 29-35

Dan Martin
Houston,Tx
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post #6 of 18 Old Nov 29th, 2005, 10:18 am
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I do think that different formulations on fuel will change mileage. A lot of places have a winter fuel I think that may make a difference in economy.
Quote:
Originally Posted by edonthenet
At 1st I thought it was the different windshield (a CB), but with the increased mileage I have ruled that out.
The weather although varied in temp hasn't been any different wind wise. And, I pretty much stay the same route on my daily work transit. I don't do much wet weather riding unless I'm caught short.
I fuel at the same place, and don't hotdog around much. Just can't figure it.
Ed

Edgar Tanner
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2003 Titan Silver LTC (Angel-returned to the heavens)
2000 Basalt LTC (Down for the count)
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post #7 of 18 Old Nov 29th, 2005, 10:26 am
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I have founnd the following with regard to fuel economy:

1) The lower the octane, the worse the MPG
2) The lower the altitutde, the worse the MPG
3) The higher the speed, the worse the MPG

One of the things that I found helps me after I use low octane fuel is to go to walmart and purchase a can of their low end carb/fi cleaner for less then 1.00 and stick it in your next tank. That boosted my mpg and gave better response. The dealer sells stuff for about 8.00 by BG but I doubt it is much better. It is just more expensive.
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post #8 of 18 Old Nov 29th, 2005, 5:01 pm
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Over the past three years, I have noticed the same thing with my '02. Mileage decreases with the temperature. Can't say why, it just happens. Mine usually drops about 5mpg during the winter. Not as severe as what you have experienced.

Dan
New Hampshire
2002 K1200LTC
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post #9 of 18 Old Nov 29th, 2005, 5:16 pm
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The AIR is thicker when it's COLD out...So it takes more gas/hp to push the COLD AIR out of the way!





just a joke guys, don't jump on me....

Justin Case
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post #10 of 18 Old Nov 29th, 2005, 5:56 pm
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By the same token the air is more dense when colder so it takes more fuel to make the same ratio in the computer. but that's a honkin big difference...
YMMV <g>

Spence

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post #11 of 18 Old Nov 29th, 2005, 6:20 pm
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The difference you are seeing probably has more to do with other factors than outside temperature. If I recall my physics correctly, as the difference in temperature between outside air and the internal engine temperature grows, internal combustion engines become more efficient, so all else being equal, your milage should increase during the winter.

I live in a heavily populated East Coast city where the EPA has mandated certain measures be taken to clean the air. The fuel sold here in the winter is a different formula than we get in the summer. My car, which gets 55-57MPG in the summer (with A/C running), only gets 47-51MPG when the winter fuel is used. If I drive to KY, where it's still cold, but they don't have the winter fuel, my milage returns to "normal."

Nath3an
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post #12 of 18 Old Nov 29th, 2005, 7:57 pm
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Great fuel information!

It's a long read, but very informative!

http://www.ethanolrfa.org/objects/pd...A/Gasoline.pdf
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post #13 of 18 Old Nov 29th, 2005, 8:26 pm
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Quote:
Originally Posted by edonthenet
When I purchased my bike in Florida I was rewarded with a 52 MPG 1,100 mile trip home. Lately though, it seems my mileage has been suffering. One night driving home in 27 degree temperature I was getting 34 MPG, very disappointing. I thought maybe it was a dirty air filter, etc.
I have noticed the same thing with my '03 LTE. Two things seem to affect fuel mileage the most; outside temperature and altitude. If you want to see some really impressive mileage out of your beast, take it up a mountain pass in the middle of the summer. Wow, try that on a Goldwing.
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post #14 of 18 Old Nov 29th, 2005, 9:25 pm
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Same Here

Quote:
Originally Posted by edonthenet
When I purchased my bike in Florida I was rewarded with a 52 MPG 1,100 mile trip home. Lately though, it seems my mileage has been suffering. One night driving home in 27 degree temperature I was getting 34 MPG, very disappointing. I thought maybe it was a dirty air filter, etc.
Yesterday while driving to work in 68 degree heat (weird for NJ autumn) the bike was getting 48 mpg, WOW! That's the best it's been in a while. Now, later on that evening when the temps dropped to 53, the mileage dropped to 44-42.
The bike has received a canisterectomy from the previous owner, and the bike still has >5000 miles. I have not done any oil or filter maint since I have owned it.
Does this bike vary that greatly with temp or can I be experiencing something different?
Ed,

Traveller does the same thing. I ride year-around. Her fuel mileage is based on the ambient temperature. In extreme summer (especially higher elevations) she gets over 50mpg. On cold (wet) winter days, using heated seats and vests, she will drop down to 32mpg.
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post #15 of 18 Old Nov 29th, 2005, 10:08 pm
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Question

Hi , the way I understand it is , that the winter formulated fuel has less BTU's per pound . So to make up for that you need to burn more of it ...patric ...

Patric Blackman
2002 K1200LT/Hannigan2+2
2010 R1200GSA ...1987 Helix...
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post #16 of 18 Old Nov 29th, 2005, 10:47 pm
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19887 Helix

Patric-

We have a Helix too but I don't recognize that model of yours......

It gets 60-70 mpg year round, as you probably know.

Wes Phillips
Lake Norman, NC

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post #17 of 18 Old Nov 30th, 2005, 1:01 am
 
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Only had mine a couple of months. Around 4000klm on the clock. I only use 98 octain Fuel and the bike is now returning just under 55mpg. This is a combination of around town and weekend riding. I know our car a Nissan Silvia goes a hell of a lot further on this type of fuel.
Average Temp I ride in is 28c to 30c that's around 85f

Nick
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post #18 of 18 Old Nov 30th, 2005, 7:17 am
 
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I'm on my fourth LT. 01,03, and two 05's. I have put a total of 149,000 on the four of them. I religiously check gas mileage on every fill up. Every one of them dropped mileage as the air temperature drops. 70's and above 45 plus. 50's, around 40 or so. 30's 37-38. As mentioned here, probably has something to do with colder air being more dense and engine ECM settings. Certainly nothing to worry about, very typical. Dick
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