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Old 07-16-2011, 11:34 AM   #106
Overdog
'Burghherfer.....
 
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Joined: Nov 2008
Location: McKees Rocks Pa.
Oddometer: 233
Just filled up and checked mileage......46.2 MPG. I gained around 10 mpg by dropping the needles one notch leaner (Takes a bit longer to run before I can take off the choke but runs perfectly after it's warmed up). This is a 74 R90/6 that has never been rebuilt...compression a bit low in right cylinder, mileage estimated at 80K.....pushing a Windjammer & big, fat Bates bags.. This particular tankful was about half on the highway and half commuting to work....and I rode normally.
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Old 07-18-2011, 10:29 AM   #107
BrokenR80RT OP
But I'll fix it.
 
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Joined: Oct 2010
Location: Michitucky
Oddometer: 157
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Quote:
Originally Posted by supershaft View Post
That kind comment just about puts a tear in my eye BRT. Sometimes I get reminded that running my crank vent to atmosphere isn't helping. Just for those types I say that my ultimate setup would be dumping my crank vent down a whales blowhole. Too long of a setup! It's all just in good fun since when push comes to shove I get all tree huggie.


I'm with ya!

Our dependence on foreign oil is largely due to our F'n tree hugger friends. In cars, all those little chemical factories (catalytic converters, AIR, EGR, fuel canister ventilation,....) are killing our opportunities to ween ourselves off the middle-east. I remember getting 45 mpg in my little 4 cylinder FORD back in the mid-eighties. Now...my gosh....I think there is a VW diesel and a few hybrids that can do that. For anyone to sell a car in the US today, it must meet standards that make it so dagged clean, that we get really shitty fuel economy, more things to go wrong, etc. Or, we gotta buy all this exotic technology, like a hybrid, that screws up the environment in other ways, like battery mfg. and disposal. I know we all have the impression that Europe is clean, but we are much stricter in the US for emissions. They have such high fuel taxation, that they all just drive smaller, yet more polluting machines than we do in the US.

Plug it all in to Alaska!
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Old 07-18-2011, 12:04 PM   #108
jeffs900s
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Joined: Feb 2004
Location: New Hampshire, USA
Oddometer: 1,159
Without turning this into CBSM, I'd say the car buying public is at least as much to blame. My old Civic was pretty clean I'm sure, had EGR, Catalytic converter, etc and still pulled 40+. It was also an uncomfortable and dangerous little tin-can compared to a 2012 Civic. Nearly everyone these days expects bigger cars, 25 cupholders, tomb-like quiet, Air-conditioning, 20 inch wheels, 12 airbags, ABS, etc. Weight is an MPG killer.
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Old 07-18-2011, 01:51 PM   #109
camgregus
riding gently now
 
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Joined: Feb 2006
Location: on the banks of the mighty mississippi, AR side
Oddometer: 2,997
all too true. My old 80s Toyota Wagon got 45 mpg and would haul a couch and an canoe at the same time!!!!! I shoulda kept the darn thing... Same engine as a prius or close. Close to the same mpg.... WAY more utility. Back seats folded up flat from the front to the rear, great for camping...
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Old 08-14-2011, 03:29 PM   #110
Cogswell
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Joined: Jan 2005
Location: Riding with my pal Richard Cranium
Oddometer: 4,061
Went out for a nice little ride today on the airhead. Had some local women riders along with limited saddle time so I kept the pace to around 50-60 mph.
I filled the bike when I left this morning. First gas stop at 179 miles it took 3.2 gallons to bring it back to full. 55.9 mpg for that run. I guess if I milked it a little more, and stayed out of the mountains I could probably get it to 60.


Mike
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The good thing is, your damn motor can't read. If it says oil on the container, it's pretty much OK to dump in there.... ED.
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Old 08-14-2011, 03:56 PM   #111
caponerd
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Joined: Jul 2005
Location: Halfway between Munich and Redditch.
Oddometer: 1,980
Quote:
Originally Posted by RecycledRS View Post
Interesting numbers on the RT fairing. I wonder if the RS fairing is better or worse. Anybody know?
My bike has been set up as a convertible for three years now. I removed the RT glovebox/air ducts to facilitate switching between RS and RT fairings.
I put the RT fairing on for winter commuting, and the RS for summer.

I get about a 10% improvement in fuel economy with the RS fairing compared to the RT.

Don't remember if I already posted milage numbers, but I get 32-40 (with RT fairing) and 35-44 (with RS fairing).
I don't work real hard at riding economically most of the time.
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Old 08-14-2011, 04:22 PM   #112
BrokenR80RT OP
But I'll fix it.
 
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Joined: Oct 2010
Location: Michitucky
Oddometer: 157
Quote:
Originally Posted by Cogswell View Post
Went out for a nice little ride today on the airhead. Had some local women riders along with limited saddle time so I kept the pace to around 50-60 mph.
I filled the bike when I left this morning. First gas stop at 179 miles it took 3.2 gallons to bring it back to full. 55.9 mpg for that run. I guess if I milked it a little more, and stayed out of the mountains I could probably get it to 60.


Mike

Uhhh..Aren't you going to tell us more about the local women?
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Old 08-14-2011, 04:49 PM   #113
Cogswell
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Joined: Jan 2005
Location: Riding with my pal Richard Cranium
Oddometer: 4,061
Quote:
Originally Posted by BrokenR80RT View Post
Uhhh..Aren't you going to tell us more about the local women?
Sure, One rides a Suzuki Intruder, next a Suzuki S40 cruiser, then a CF-Moto 250 scooter rider, and last but not least E. rides a 1972 ? Honda CB450 twin and has about 33K miles on it.
All are not married, some like other women, and they all love to ride and have fun !





Mike
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The good thing is, your damn motor can't read. If it says oil on the container, it's pretty much OK to dump in there.... ED.
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Old 08-14-2011, 05:15 PM   #114
Lornce
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Joined: Aug 2003
Location: Way Out There.
Oddometer: 17,764
Did a fly and ride to BC to collect an '83 R80G/S-PD. First tank generated 32mpg imperial, or about 25mpg US. Ran crappy and stunk of raw fuel. Somebody along the line of PO's set the needles in the richest position. I cleaned the crud out of the jets and set the needles in the second leanest position. Bike ran sharper and fuel economy fluctuated between 46 to 56mpg imperial. (subtract approx 20% to get a US mpg figure).

Even at 56mpg, that's way too much fuel consumed for such docile power, imho.




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Old 08-14-2011, 06:21 PM   #115
supershaft
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Joined: Sep 2010
Location: San Francisco Bay area
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Hot rodding mine got me better mileage.
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Old 08-14-2011, 06:26 PM   #116
Kurt V
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Joined: Oct 2008
Location: Jefferson City, MO
Oddometer: 231
Put some new plugs in my '76 R75/6 and went for a back roads ride yesterday. Went 125 miles and filled up when I got back took 2.5 gallons so 50mpg doing mostly 55-65 mpg. Stock bike with 43K miles. Pulled the plugs and the color was perfect!
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Old 08-15-2011, 12:20 AM   #117
Desert2202
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Joined: Jul 2009
Location: Alice Springs Central Australia
Oddometer: 681
Last week I specifically did a fuel range check on my 92 R100GS.

I was getting 15km per litre (haven't a clue what that is in mpg) at a constant 100kph.

From full tank to reserve was 285km then from reserve to bone dry was 65km for a total of 350km.

For a carby bike I think that is pretty good, the plugs are a beautiful cream colour (not running rich at all), I have no idea what the needles are set at as I just bought the bike a month ago, but I aint playing with them as she's running great
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Old 08-15-2011, 06:43 AM   #118
chasbmw
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Joined: Feb 2006
Location: Bath Uk
Oddometer: 1,880
My 1070 kitted bike gets around 40-45imperial mpg being used normally, in touring mode with a friend riding a more modern R100R it gets up to 50mpg using around 10-15% less fuel than the R100R. This bike is dual plugged ported, dells, full open 40mm exhaust etc etc.

My R90/6 which is dual plugged with a highish compression ratio but otherwise fairly stock gets around 45-55 mpg depending on use, I was hoping to get a bit more out of this bike. All figures are taken from brim to brim on the tank, using the BMW mileometer. On the R90 I have a useful range of around 200-220 miles before using the second petcock.

How many liters is a R90 tank?
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Old 08-15-2011, 06:50 AM   #119
Lornce
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Joined: Aug 2003
Location: Way Out There.
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Quote:
Originally Posted by chasbmw View Post
How many liters is a R90 tank?
The small hold 18 and the large tanks hold 24 litres.
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Old 08-15-2011, 07:06 AM   #120
Lornce
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Joined: Aug 2003
Location: Way Out There.
Oddometer: 17,764
Quote:
Originally Posted by DesertKLR View Post
I was getting 15km per litre (haven't a clue what that is in mpg) at a constant 100kph.
That's approx 42mpg imperial. About the same as my '92 R100GSPD before it was modded.

42mpg imperial equates to 34.5mpg US.

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