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Thread: 1985 K100RS fuel mileage check.

  1. #1
    Registered User mcmlcccvrs's Avatar
    Join Date
    Jan 2020
    Calgary, Alberta, Canada

    1985 K100RS fuel mileage check.

    Not sure if anyone is interested but just for you-know-what and giggles I thought I'd do a fuel mileage check today on a 280 mile round trip from Calgary to Lethbridge, Alberta. No wind to speak of really. Most flat with some undulations but nothing of any significance. Just me at 174 lbs with side cases, top case and an Aeroflow screen. I held a steady 70-75mph with an occasional pass at 80mph. I filled it up to the exact same level as when I first gassed up. It took 12.195l or 2.68 Imp gallons for 132 miles, which is 49.25 mpg on 87 octane. Won't fill up again until I go out for another ride so I don't know what the return trip will yield. It was also different routing with headwinds at certain points. I don't know what modern 1000cc bikes are getting but I would think that this is pretty respectable for a 37 year-old bike at those speeds. Or am I wrong?

    On a side note, I got my hands (literally) on a set of Pro Grip 699 street gel grips in an attempt to reduce vibration at the bars. It wasn't as much as I'd hoped for but a tiny reduction nevertheless.
    Last edited by mcmlcccvrs; 09-01-2022 at 01:44 AM.

  2. #2
    RK Ryder
    Join Date
    Sep 2005
    London, Ontario
    Your mileage beats my 87 K100RT which averages around 45 miles per imperial gallon, sometimes a bit better. In order to avoid ethanol eating the rubber parts in the gas tank, I run ethanol free Shell V Power.
    Paul F. Ruffell
    Retired and riding my RTs, the '87 K100 & the '98 R1100 !
    Knights of the Roundel #333

  3. #3
    Over it's life, my '85 RS has averaged mid 40's in gas mileage on US Gallons, which approximates your mileage on Imperial gallons.
    Also, the K1100 16v engine is much smoother than the original K100 8v, but both have an annoying buzz (less on the 16v) at lower highway speeds.

    '17 R1200RS, '03 R1100S BCR#6/200, '85 K100/1100RS, '16 R1200RS (gone) '11 R1200RT (gone) '05 R1200ST (gone) '99 R1100S (gone) '96 Ducati 900SS/SP (gone) '92 K100RS (gone) 500,000+ BMW miles

  4. #4
    My 92 K100RS 16V averages about 45 mpg in a mix of local and highway riding.
    Less barking, more wagging.

  5. #5
    Dances With Sheep GREGFEELER's Avatar
    Join Date
    Mar 2003
    Boise, ID
    By my math, your 2.68 Imperial Gallons converts to 3.218546 US Gallons, which equals 41.02 miles per US gallon. I had a 1987 K100RT which would get between 40 and 44 MPG (US). My K1 will get typically 50+ at 75 to 85, but it has the 4-valve 1 liter engine with the Motronic FI and amazing aerodynamic body work.
    Greg Feeler
    Member at large
    1972 R75/5, 1990 K75, 1990 K1, 1992 K75S, 2003 K1200RS

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