Page 1 of 2 1 2 LastLast
Results 1 to 15 of 17

Thread: '95 R100RT gas mileage

  1. #1
    On the Road
    Join Date
    Dec 2011
    Posts
    23

    '95 R100RT gas mileage

    I'm fond of my '95 R100RT; but according to all the info I have come across, it gets lousy mileage. Every source claims about 52-54 mpg at a steady 55mph or so. I am not an aggresive rider. Most would say timid. My route to rural riding is through about 5 miles of 45mph town streets (no stop and go) and then open country for a leisurely ride. My last ride reflects what I have been getting every time I check mileage. From a full tank I put on 161 miles and needed 4.3 gallons to top off. Less than 40 mpg. Bike has had very recent dealer service with no problems reported, and plugs show no sign of running rich. Any ideas. thanks - Dick Otten SW Florida

  2. #2
    Administrator 20774's Avatar
    Join Date
    Sep 2005
    Location
    San Antonio, TX
    Posts
    13,176
    Probably wouldn't take much of an off-setting to make a difference but not see it on the plugs. Maybe the jet needle or needle jet is worn the carb...sounds like you run around mid-throttle most of the time which is the needle part of the circuit. Maybe you're choke doesn't go all the way off. I would hope the air filter is reasonably clean. Tire pressures? There's always a lot of discussion about that...I think the popular thing to do is rund 34 front and 36-38 in the rear, depending on weight and stuff being carried.
    Kurt -- Forum Administrator ---> Resources and Links Thread <---
    '78 R100/7 & '69 R69S & '52 R25/2
    mine-ineye-deatheah-pielayah-jooa-kalayus. oolah-minane-hay-meeriah-kal-oyus-algay-a-thaykin', buddy!

  3. #3
    Minnesota Nice! braddog's Avatar
    Join Date
    Jun 2003
    Location
    Twin Cities - MN
    Posts
    1,925
    Quote Originally Posted by DickOtten View Post
    I'm fond of my '95 R100RT; but according to all the info I have come across, it gets lousy mileage. Every source claims about 52-54 mpg at a steady 55mph or so. I am not an aggresive rider. Most would say timid. My route to rural riding is through about 5 miles of 45mph town streets (no stop and go) and then open country for a leisurely ride. My last ride reflects what I have been getting every time I check mileage. From a full tank I put on 161 miles and needed 4.3 gallons to top off. Less than 40 mpg. Bike has had very recent dealer service with no problems reported, and plugs show no sign of running rich. Any ideas. thanks - Dick Otten SW Florida
    The only time I've ever gotten over 40 MPG on either of the R100's I've owned is when I've been able to use non-ethanol gas and put on steady highway miles. My commuting has always resulted in less than 40 MPG, usually around 35 or 36.

    I've got no good technical information for you Dick, I'll leave that to the good folks on here who can give it to you accurately. However, I think there are many more folks who get far less than 50 MPG than those who do on their R100's.
    -----------------------------------------
    Brad D. - Member #105766
    '77 R100RS - Black Beauty (big pipe, baby!)
    '94 R1100RS - Sylvia

  4. #4
    James.A
    Guest
    I'd agree with Braddog. I have lately been commuting on a newly rehabilitated 1988 R100RS. While I HAVE been riding it in a spirited fashion, the mileage is running in the mid-30's in MPG. By contrast, My R75/5 gets well into the 40's regardless of riding style.

  5. #5
    Registered User 88bmwjeff's Avatar
    Join Date
    Aug 2004
    Location
    Walnut Creek, CA
    Posts
    2,555
    This subject has been discussed numerous times over the last five or so years. You may want to search for previous discussions. I have an 88 R100 RT. The bike averages in the mid-30's. The monoshock R100's with the 32mm carbs tend to get lower MPG than their predecessors. From what I've gathered on this forum and Boxerworks, is that mid-30's seems to be typical for late model R100's.

    On a side note: Bing recommends changing the idle jet, main jet, and needle jet. They claim the bikes were jetted lean for emissions. When I got the bike, I rejetted the carbs to Bing's recommendations. I have since jetted them back to stock, but I haven't put enough miles on it to see if it makes a difference.

    Edit: as for ideas...stop worrying about MPG, enjoy riding the bike, and ride it like you stole it.
    Jeff in W.C.
    1988 R100 RT (the other woman)
    "I got my motorcycle jacket but I'm walking all the time." Joe Strummer

  6. #6
    Registered User toooldtocare's Avatar
    Join Date
    Mar 2008
    Location
    Lake Saint Louis, MO
    Posts
    1,726
    About what my three R100's got, 78 and 88 RS, and 95 RT.

  7. #7
    On the Road
    Join Date
    Dec 2011
    Posts
    23
    Thanks for the info. I guess the 54 mpg came from some fantasy world, or all downhill riding.

  8. #8
    Registered User
    Join Date
    Feb 2012
    Posts
    137
    Quote Originally Posted by DickOtten View Post
    Thanks for the info. I guess the 54 mpg came from some fantasy world, or all downhill riding.
    Dick,

    Maybe the 54mpg fantasy is simply accounted for in the difference between a UK (Imperial) gallon and a US gallon. A UK gallon is 1.2 US gallon. Therefore, 54 miles per UK gallon = 45 miles per US gallon.

    Talking US mpg, my regular commuting run on my 36,000-mile 1994 R100RT is a 15 miles one way trip that is half surface streets and half highway. Here, 33mpg is the norm using 87 octane gas containing 10% ethanol. 36mpg is the norm on longer local journeys that combine urban and suburban runs. Long runs with a light load and light throttle will see 40 to 42mpg.

    In normal riding my 22,000-mile 1993 R100R shows up to 3mpg better economy under similar duties. I think that this is attributable to the fact that the RTÔÇÖs fairing disguises speed/acceleration, so I tend to run a little faster/harder riding it than my naked R.
    Mark

    Current - '74 TR5T : '93 R100R : '06 ST3s ~ Past - Variety of British, French, Italian, Czechoslovakian, and German bikes from the '70s, '80s and '90s

  9. #9
    Registered User bmweuro's Avatar
    Join Date
    Oct 2009
    Location
    Northern Cal
    Posts
    255
    An improvement would be to replace the slide needles and needle jets. It's one of those never thought about wear items. I have seen positive results in doing so.
    www.boxermetal.com
    www.facebook.com/boxermetal
    VBMWMO #7770, BMW MOA #48694, ABC #600
    Hi my name is Chris and I am a slash-five-o-holic.

  10. #10
    Registered User
    Join Date
    Sep 2007
    Posts
    3
    I have noticed that my mpg has decreased ever since E 90 gas gas appeared on the market.

  11. #11
    Luddite Looney wecm31's Avatar
    Join Date
    Jun 2009
    Location
    Eganville, Ontario
    Posts
    348
    Quote Originally Posted by bmweuro View Post
    An improvement would be to replace the slide needles and needle jets. It's one of those never thought about wear items. I have seen positive results in doing so.
    Apart from any touring I do, my commute to work is a standard benchmark for gas mileage. I was getting 42 MPG, after new needle and jet that went to 45 MPG.
    that's better than 5%, well worth the effort. Toss in new diaphragms while you are in there and maybe some floats too!!

    Note: Commute is flat, constant speed of 60 mph and Imperial gallon (ie 4.55 litres). Premium fuel (90 octane), no ethanol.
    Gerald P
    The last thing I want to be is just like everyone else...
    1985 R80RT
    1969 Sport Fury Convertible

  12. #12
    Registered User
    Join Date
    Feb 2012
    Posts
    137
    Quote Originally Posted by wecm31 View Post
    Apart from any touring I do, my commute to work is a standard benchmark for gas mileage. I was getting 42 MPG, after new needle and jet that went to 45 MPG.
    that's better than 5%, well worth the effort. Toss in new diaphragms while you are in there and maybe some floats too!!

    Note: Commute is flat, constant speed of 60 mph and Imperial gallon (ie 4.55 litres). Premium fuel (90 octane), no ethanol.
    42 miles per UK/Imperial gallon = 35 miles per US gallon
    45 miles per UK/Imperial gallon = 38 miles per US gallon

    If I get to run gas with no ethanol, economy improves maybe as much as 10% (do not really have a lot of data on running with "pure" gas).

    I see no difference in fuel economy when I have experimented with running my "stock" 87 octane "Regular" (remember this is the US, so octane is [RON+MON]/2) and Mid-Grade and Premium rated gas.

    Agreed, that new needle and jets can make a difference. It made a noticeable difference on the R65 I used to own, but I never tracked fuel economy on that bike so cannot quantify further.
    Mark

    Current - '74 TR5T : '93 R100R : '06 ST3s ~ Past - Variety of British, French, Italian, Czechoslovakian, and German bikes from the '70s, '80s and '90s

  13. #13
    On the Road
    Join Date
    Jul 2009
    Posts
    78
    I have a 94 R100RT and have been keeping track of my mileage. I'm not a constant tourer but I have kept track of my long distance, constant 70-80mph rides and I get about 42mpg. I do add a bit of Seafoam every other tank and I run Iridium plugs. The gas we get in Michigan all seems to have a Ethanol in it and octane can't be counted on to be accurate. I'm not sure if the plugs will make a difference - a guru can let me know about that... Good travels..

  14. #14
    Registered User
    Join Date
    Jun 2012
    Location
    Paramus, NJ
    Posts
    34

    Peter

    My recently purchased 2004 R1150RT is getting 38mpg. without speeding. We have 10% Ethanol here in NJ. I can live with it.

  15. #15
    Bluenoser
    Join Date
    Mar 2010
    Location
    Lethbridge Alberta
    Posts
    456
    Quote Originally Posted by DickOtten View Post
    I'm fond of my '95 R100RT; but according to all the info I have come across, it gets lousy mileage. Every source claims about 52-54 mpg at a steady 55mph or so. I am not an aggresive rider. Most would say timid. My route to rural riding is through about 5 miles of 45mph town streets (no stop and go) and then open country for a leisurely ride. My last ride reflects what I have been getting every time I check mileage. From a full tank I put on 161 miles and needed 4.3 gallons to top off. Less than 40 mpg. Bike has had very recent dealer service with no problems reported, and plugs show no sign of running rich. Any ideas. thanks - Dick Otten SW Florida
    Mileage is a mugs game. All kinds of claims but in actual fact it varies greatly depending on the way you ride the bike. No 2 people are going to get the same mileage.

    If you want to find out the actual mileage, fill the tank to its maximum, set your trip meter to zero go for a 150-200 mile ride on the highway/intersate, stop fill up the tank to the same level and do the return trip,then fill it up again. That will give you a pretty good idea of what mileage you are actually getting.

    It's been my experience that you can see a 5 mpg difference just to wind/temp conditions, so if you are in the range of 40-45 you are doing fine.
    1971 R50/5 SWB with R75/6 drivetrain
    2013 DL650

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •