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Old 06-21-2011, 05:50 AM   #61
Big John Sny
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Location: Irving, Tx
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Quote:
Originally Posted by Stagehand View Post
its 10% here. :sad
I believe 10% here as well
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Old 06-21-2011, 10:55 AM   #62
DandyDoug
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Since I just got my 1985 R80 naked I checked a tank full and got 37.7mpg.

Have since added a Parabellum sport shield and if it ever cools off or stops raining I'll check a tankful to see if there is any improvement in mpg.

Not expecting much improvement since the windscreen is much larger than I thought it would be.
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Old 06-21-2011, 11:05 AM   #63
Sniper X
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Location: Central New Mexico, 7420ft above sea level
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Not sure on the R60 400mpg it seems like, but the R100RS is in the 40 range if I am not a hooligan. I have 40mm Mikunis that are a tad bit rich so there's that on the R100RS....
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Old 06-21-2011, 12:29 PM   #64
RonZacapa
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Location: Durban - East Coast of Africa
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Bought a R100RS - '81 model a week ago in Cape Town and rode it back to Durban after the obligatory tappet and oil check, about a 1000mile trip over 2 days in the African midwinter. Cruising at 130-160 kph (80 - 100mph) conditions allowing; consumption was around 6.9 litres / 100km, 30 year old Bings included. Got drenched in Cape Town at 5 degrees C and for the next 200km up to Touwsrivier, slight hypothermia was averted by timely change into dry clothing and from then on things and weather got better. Leaking oil cooler had the RH side and footrest covered in slippery stuff and the seat was sat through by previous owners over the last 115K miles. Mechanically though she's as good as they get for a 30 year old classic. Will be wrenching away happily for the next year or so to get the RS sorted.
Ron

The online calculator says thats 34mpg at 80-100 mph cruising speed so i'm happy, i had as bad as 22mpg before on an R80 '86 edition packed with pannier cases, huge tank bag, army ammo cases on top and other wind-resisting items attached riding into 20 knot headwind.
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Old 06-21-2011, 01:19 PM   #65
Stagehand
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I guess we know who the hooligans are
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Old 06-21-2011, 01:43 PM   #66
squish
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Scratch that, see my latest post 10.13.11
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Old 06-21-2011, 05:18 PM   #67
Rapid Dog
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Cool2 hooligan-ain'tisms

Quote:
Originally Posted by Stagehand View Post
I guess we know who the hooligans are

...hey, I twist the handlebar twister thang as far as it will go!...and I have short gear dealies like Lornce said.
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Old 06-23-2011, 05:02 PM   #68
Wirespokes
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I'll bet those of us with higher compression engines get the better mileage.

Vehicles in Brazil and elsewhere in S Amarica burn alcohol, not gasoline. The Vincent Black Shadow (or was it the Lightning?) was set up for alcohol and had a 5mph higher top end.

So it's not true that alcohol won't work as a fuel. But what is important is that engines running on alcohol require higher compression - like 14:1 - to extract the energy from it.

Not even considering the alcohol, higher compression ratios are more efficient and return more miles per gallon, besides having more horsepower.
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Old 06-23-2011, 06:02 PM   #69
Jasper ST4
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I just ran the figures this morning. A hair over 40mpg doing backroads and 80mph up the freeway back (143 miles). 167,000 miles, original pistons and cylinders...and it ain't burnin' oil. I have 40mm Bings and heads off a '84 RS.
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Old 06-23-2011, 06:07 PM   #70
R100RT Mark
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As I have a number of bikes that I swap between, unless I am on a long trip I zero the trip when I go onto reserve and I add three gallons at each “fill” (three gallons is the highest common denominator amongst the various tanks sizes). That way I have a good idea from the trip how much gas/how many miles to the next stop given each bike’s economy history.

I’m talking US gallons and 10% ethanol blend. Pre-ethanol fuel economy was about 10% higher. There are several gas stations in the North Georgia Mountains that still sell 100% gasoline. All my airhead’s runs happier and further/gallon on this hard stuff.

My ’94 R100RT varies between 33 and 37mpg. 33mpg if the bike is a little out of tune or I’m heavy handed in Atlanta interstate commuting traffic at 70-ish mph. 37mpg it I keep the speed down below 60mph or do longer trips. One-up and loaded with camping gear for a weekend does not make much difference, I think because I tend to be gentler running distances than shorter hops. Economy on this bike seems to be very sensitive to float height and carb balance – not things that need a lot of attention, but worth checking once in a while.

My ’84 R65 (recently sold) would average around 45mpg regardless of duty.

My ’93 R100R (recently acquired) has averaged 35mph on the two fills I’ve done so far. My guess is that this will improve when (a) I get around to balancing the carbs, (b) the lengths of my trips increase as part of my routine in getting familiar with any “new” the bike, and (c) my riding style becomes more fluid as I get used to the bike’s idiosyncrasies.

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Old 06-23-2011, 09:20 PM   #71
Stagehand
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I just upped to nine point five pistons and the mileage essentially hasn't changed. Its been three tanks at least, almost. I would have expected greater results if it were in there. Tho as I said, I keep trying to get up to sixty five as fast as possible.
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Old 06-23-2011, 11:40 PM   #72
channelcat
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showing 110-115 psi per cylinder, but after 15 years finally figured out how to set the throttle -at-carb freeplay in real world not the book terms. idles happily at 1000 rpm, and gets 40mpg in everyday combo riding.
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Old 06-24-2011, 12:44 AM   #73
Sibbo
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Quote:
Originally Posted by squish View Post
I don't know the MPG since I never sat down to figure it out

R80ST 118miles to reserve(only one on this bike) on the freeway below 70mph, 100miles to reserve above 70 or playing in the twisties

R80 140miles to reserve-1, (of two) riding in "normal" Los Angeles traffic

R100GS 160miles to reserve-1 (of 2) riding in "normal" Los Angeles traffic with only a limited amount of freeway riding.

All three bikes have stock tanks. and the GS has had a flapperectomy
81 ST with a GS100 tank .I get 6.5 litre /100 km or 37 mpg US regularly sitting on 65 to 70 mph ,my normal cruising speed .
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Old 07-04-2011, 04:51 PM   #74
BrokenR80RT OP
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Cool2 Updated Chart

We are averaging 41.4 mpg for the ADV replies and 42.8 mpg for the BMWMOA responses. Very close to each other.

Enjoy!

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Old 07-04-2011, 07:43 PM   #75
bmwhacker
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Fuel economy?....... ..... 25 on a good day. The big tank still ain't big enough.

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