V-Stream vs. Stock shield, mpg. - BMW Luxury Touring Community
 
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post #1 of 6 Old Jul 4th, 2008, 7:59 pm Thread Starter
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Unhappy V-Stream vs. Stock shield, mpg.

I bought a V-Stream about a year ago. I began to suspect that it had reduced my mileage "about 2 mpg". I decided to do a proper test. As a former Engineering Technician, I know about things like lurking variables and did my best to eliminate them. Each shield was tested 90% at 70 mph* on the Interstate, and 10% at 62 mph* on state 2 lane highways. The tests were replicated. Here's the data:
V-Stream Run #1 45.76 mpg Run #2 44.88 mpg Avg. = 45.32 mpg
Stock Run #1 47.88 mpg Run #2 46.77 mpg Avg. = 47.33 mpg
for a difference of 2.01 mpg. However, noting the difference in the runs, I'm only comfortable calling the difference "about 2 mpg".

The V-stream is a little bit quieter. It also made the bike just a little unsteady between 65* and 79* mph. (it's a very big shield).

*actual speed, not BMW speed, as determined by a digital Sigma sport speedo calibrated to within 1/2%.
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post #2 of 6 Old Jul 4th, 2008, 8:29 pm
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Re: V-Stream vs. Stock shield, mpg.

Interesting as I am considering getting a new shield to replace my scratched stock shield. Of course, increased mpg claims will be something I'll be looking at.

What year is your LT? Did you use the same gas from the same pump for all tests?

Also, was your screen full up in each test?

Kevin
'06 K1200LT
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post #3 of 6 Old Jul 4th, 2008, 8:32 pm
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Re: V-Stream vs. Stock shield, mpg.

Quote:
Originally Posted by HarvRead
I bought a V-Stream about a year ago. I began to suspect that it had reduced my mileage "about 2 mpg". I decided to do a proper test. As a former Engineering Technician, I know about things like lurking variables and did my best to eliminate them. Each shield was tested 90% at 70 mph* on the Interstate, and 10% at 62 mph* on state 2 lane highways. The tests were replicated. Here's the data:
V-Stream Run #1 45.76 mpg Run #2 44.88 mpg Avg. = 45.32 mpg
Stock Run #1 47.88 mpg Run #2 46.77 mpg Avg. = 47.33 mpg
for a difference of 2.01 mpg. However, noting the difference in the runs, I'm only comfortable calling the difference "about 2 mpg".

The V-stream is a little bit quieter. It also made the bike just a little unsteady between 65* and 79* mph. (it's a very big shield).

*actual speed, not BMW speed, as determined by a digital Sigma sport speedo calibrated to within 1/2%.
That's interesting!
I just put a CB shield on; a -2", and I am getting 2 mpg more.

If we would all vote these liberal elitist's out of office; who would give a rat's *** about gas mileage 'eh?
Then we would have more time to enjoy this wonderful German engineering.

Ride safe, ride smart, you're invisible; NOT invincible.

2016 R1200RTW Bronze

Before:
2009 K1200LT
2006 K1200GT
2004 R1200RT
1987 R80RT
1980 R100RT
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post #4 of 6 Old Jul 5th, 2008, 7:58 am Thread Starter
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Cool Re: V-Stream vs. Stock shield, mpg.

Quote:
Originally Posted by sonnata
Interesting as I am considering getting a new shield to replace my scratched stock shield. Of course, increased mpg claims will be something I'll be looking at.

What year is your LT? Did you use the same gas from the same pump for all tests?

Also, was your screen full up in each test?
1. It's a 2000
2. That was covered under "lurking variables".
3. Both shields were adjusted so that my line of sight hit the ground about 50' in front of the bike. About 3/4 up.
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post #5 of 6 Old Jul 5th, 2008, 10:56 am
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Re: V-Stream vs. Stock shield, mpg.

Ditto on mine. The V-Stream lowered my mileage, but after all what do you expect it is blocking more air and that has to come with a price. I'll put her back on in the winter but I am back to massive air flow with the Euro shield for the hot summer.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #6 of 6 Old Jul 5th, 2008, 6:27 pm
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Re: V-Stream vs. Stock shield, mpg.

This is why I expect to buy a Parabellum windshield. They guarentee an improvement in MPG and give you 30 days to test ti on them as well.

2006 Magnesium Black Metallic K1200LT (sold - sigh)
1996 Sinus (aka Cirrus) Blue Metallic R1100RT
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