F800GS Gas Mileage: What Ya Gettin'?

Discussion in 'Parallel Universe' started by robhar54, Nov 22, 2008.

  1. Bucko

    Bucko In a parallel world

    Joined:
    Mar 20, 2004
    Oddometer:
    822
    Location:
    South Coast, CA
    They were thinking that you'd get the remap done or carry octane booster if you wanted to travel to places where there's no premium gas, and that you'd be thankful they kept the price of the bike down by not fitting a knock sensor. I'm not sure they were thinking really well...
    #21
  2. RobStar

    RobStar Still On Training Wheels

    Joined:
    Feb 13, 2009
    Oddometer:
    437
    Location:
    Las Vegas Baby!
    <table id="post8432303" class="tborder" align="center" border="0" cellpadding="4" cellspacing="0" width="100%"><tbody><tr valign="top"></tr><tr valign="top"><td class="alt1" id="td_post_8432303"> <!-- icon and title --> F800GS Gas Mileage: What Ya Gettin'?
    <hr style="color: rgb(87, 87, 87);" size="1"> <!-- / icon and title --> <!-- message --> The Variables:
    Units: Miles per US gallons
    Odometer: Exactly 509 miles
    Rider: 5'11" 175 lbs
    Luggage: Jesse Odyssey II sides only loaded with guns, ammo and day kit for 75% of the miles
    Windscreen: Stock
    Exhaust: Stock
    Misc: Adv-Spec crash bars and bash guard
    Riding Conditions: Mix of highway at 65-75 mph +/-, twisty back roads, six crossings over the Spring Mountain Range, many short trips and errands, three 100+ mile days. Extremely windy conditions!
    Results:
    Over the course of the first 509 miles I've averaged only 30.3 miles per gallon.

    I also found out yesterday coming back from the Death Valley area that 0 miles left on the OBC, really means 0 miles left! Like a switch, the engine cut off when the display moved to zero. Fortunately, I had decided to turn left to Pahrump for fuel rather than risk heading to Las Vegas on Hwy 160. By the graces of good luck or karma the engine quit 200 yards from the Shell station and I coasted into the pumps with about 15 feet to spare!

    I'm a new rider and the dealer told me to ride it like I stole it during the break-in period so that is exactly what I've been doing; high rpms and no chug-a-lugging. Maybe I twisted the throttle up to 85-90 mph for a few seconds... maybe :nod

    30 mpg isn't so great and I suspect it is reflective of the break-in and hard riding. None-the-less, it's still almost 3x better than the 11.5 mpg average on my Hummer. :clap

    RobStar
    <!-- / edit note --> </td></tr></tbody></table>
    #22
  3. The Griz

    The Griz Long timer

    Joined:
    Nov 26, 2008
    Oddometer:
    3,851
    Location:
    Minnesota
    The OBC tells me I'm getting around 45mpg. But it's still too early to tell. I'll post again when I have harder long distance evidence. It's still not Spring yet here in Minnesnowta.
    #23
  4. dholaday

    dholaday Been here awhile

    Joined:
    Nov 25, 2008
    Oddometer:
    360
    Location:
    White Salmon, WA
    Wind can make a heck of a difference. I've seen my mileage - on an RT - vary by 20+ mpg depending on if I had a head- or tail-wind. And an RT is more aerodynamic than the GS; my guess is that the cd of a GS+Rider is close to .9: only marginally better than pushing a steel plate thru the air :D


    Another good argument for carrying a couple of Sigg bottles full of fuel. Glad you made it to the Shell station.
    #24
  5. RobStar

    RobStar Still On Training Wheels

    Joined:
    Feb 13, 2009
    Oddometer:
    437
    Location:
    Las Vegas Baby!
    Agreed, I'm completely upright on the GS, the Jesse bags are boxy and the last 4-5 days have been winds at 20-25 mph with gusts in the 30+ range. The week before was very windy too. There's no hiding from the wind here, plus when you get into the canyons it's crazy coming from every direction.

    REI and Sigg bottles are on my list for tomorrow...:doh

    ** Sigg no longer makes fuel bottles - I bought two 30 oz MSR fuel bottles w/o the child-resistant caps today at REI for $15 each **
    #25
  6. kkug

    kkug Been here awhile

    Joined:
    Feb 9, 2004
    Oddometer:
    980
    Location:
    Escondido Ca .USA
    I run her out yesterday at 167 miles on the GPS.
    I thought I got a good fill at the station. Was doing some off roading-first gear-sand work. Kinda sucked-lucky I was riding with some one. That tankfull was about 42 MPG.
    #26
  7. The Griz

    The Griz Long timer

    Joined:
    Nov 26, 2008
    Oddometer:
    3,851
    Location:
    Minnesota
    For MPG today, my OBC was throwing numbers pretty consistent with what BMW claims. 60 mpg or so at 55 mph, and 45 mpg or so at 70 mph. However, I'm a bit concerned with the the number it was posting for "miles until fill." With a full tank of gas it was saying 134 miles until fill needed. weird. Shouldn't it say more like 210 or 220 miles? Thoughts?
    #27
  8. Lost Roadie

    Lost Roadie Rider

    Joined:
    Oct 15, 2006
    Oddometer:
    3,595
    Location:
    On The Road
    In the last 5 weeks or 8,000+ miles I've noted the following MPG while in full touring dress:

    60 MPH casual straight line ride, don't remember where exactly, but when I needed to stretch my tank this was my optimum speed = 62 MPG

    60MPH spirited riding on tarmac with twisties ( PCH for example) = 46MPG

    78 MPH interstate riding (that not get a ticket but make time through the midwest speed) = 43MPG

    20 - 70 MPH spirited dirt/gravel road riding, baja, DV, moab, etc. = 37MPG

    110 MPH+ hauling ass for hours in the desert riding = 28 MPG

    After a few weeks I stopped keeping tabs the old fashioned way because the computer was always real close for the MPG. When the gas light comes on you have 1 gallon left, so how you're riding dictates how far you'll get...
    stretch it 60 miles or get to the gas station 25 miles away in less than 15 minutes... choose wisely. :evil
    #28
  9. The Griz

    The Griz Long timer

    Joined:
    Nov 26, 2008
    Oddometer:
    3,851
    Location:
    Minnesota
    But what explains the low "miles to fill needed" reading?
    #29
  10. Calibob

    Calibob Lost Soul

    Joined:
    Mar 13, 2009
    Oddometer:
    27
    Location:
    So Cal
    Same here... When I fill up, my OBC shows a "greater than" > symbol before the projected miles to refill. I read somewhere that this is normal and the OBC won't start counting down until your below the "greater than" predicted mileage.
    2100 miles and I have been averaging about 56mpg
    75-80 mph highway...
    #30
  11. Nemesis

    Nemesis just ride the damn thing

    Joined:
    Jan 8, 2004
    Oddometer:
    422
    Location:
    a van down by the river
    If you consult you Mexican friend Manuel he will tell all (on page 41)....


    :deal
    #31
  12. RedHawk47

    RedHawk47 Adventurer

    Joined:
    Oct 5, 2006
    Oddometer:
    735
    Location:
    Berthoud, CO
    I've been getting about 45 mpg per the OBC, so I'm jealous. Mostly a 8 mile commute on country roads with few stops.

    But I figured something out this weekend. I've been doing most of my riding with the OBC set on ambient temperture - because it's been cold and I wanted to know how much protection I needed for what the temperature was.

    It has been warmer lately so I changed the OBC to show my current fuel comsumption. I found that if I accelerate to "X" mph my fuel usage will be "Y" mpg. But if I accelerate to "X+5" mph and then slow down to "X" my fuels usage will be "Y+10" mpg. I was testing mostly around 50 mph. Don't know how well it works at higher speeds but I expect it will still make some difference. Your thoughts are appreciated.
    #32
  13. sysie

    sysie Been here awhile

    Joined:
    May 6, 2007
    Oddometer:
    280
    Location:
    Melbourne, Australia
    281.8km done and still 136km to go, that is 417.8km (259.6 miles) on a tank !, have to add that this was mostly doing 80 - 90km/h on gravel :evil and the nearest fuel was far ahead..... so my primary objective was to save fuel..

    This is 26km/l or 61.8 m/g

    [​IMG]
    #33
  14. The Griz

    The Griz Long timer

    Joined:
    Nov 26, 2008
    Oddometer:
    3,851
    Location:
    Minnesota
    Been pulling 48mpg @ 65-70mph with panniers on and fully loaded. 15-20mph winds.
    #34
  15. The Griz

    The Griz Long timer

    Joined:
    Nov 26, 2008
    Oddometer:
    3,851
    Location:
    Minnesota
    Makes sense.:thumb Seems to be along the lines of what I'm getting at those speeds too.
    #35
  16. cba191

    cba191 wanna buy a monkey?

    Joined:
    Sep 23, 2004
    Oddometer:
    832
    Location:
    SLC, UT
    i need to fill up tomorrow, and i'm at 220 miles with no low fuel indicator yet. this is primarily with 75mph commuting. i've noticed that with the weather warming up, my mpg is improving dramatically/
    #36
  17. cba191

    cba191 wanna buy a monkey?

    Joined:
    Sep 23, 2004
    Oddometer:
    832
    Location:
    SLC, UT
    whoops. another victim of the lacking accuracy of the fuel gauge. filled up this morning and she took just over 4 gallons. :huh
    #37
  18. The Griz

    The Griz Long timer

    Joined:
    Nov 26, 2008
    Oddometer:
    3,851
    Location:
    Minnesota
    I have 148 miles on my current tank of gas. The OBC tells me I have 52 miles until I need to fill. So I'm assuming the fuel light will come on in 20 miles or so. I'm getting kind of sketched out with this fuel level sensor consistency. How am I getting this bad gas mileage? Shouldn't I be pulling at least 200 miles before the fuel light comes on? I'm still in the break-in process. I've got 400 miles on the bike.
    #38
  19. neilsmiff

    neilsmiff Adventurer

    Joined:
    Jan 15, 2007
    Oddometer:
    17
    Location:
    Wales (mon - fri) : Lincolnshire (sat - sun), UK
    I'm a XTZ750 rider looking at the GS at the mo'. Browsing through the BM brochure (the UK one at least) it says there's a factory option to get it mapped to run on 'low octane' gas. Can't remember the figures or the rating method, sorry.

    Not much help if you've already got one I s'pose but it may mean the remaps an easy one to get done by the dealer.

    Interestingly what's the story if you get a 'low octane' mapped bike and then run normal gas - say 95 RON (UK)???? any ideas....?

    Neil Smiff
    ___________________
    too many to remember:
    Cagiva E900
    Honda RT03
    Kawasaki KLR650
    Kawasaki KDX200
    Lots of Italian stuff.
    #39
  20. Bayner

    Bayner Long timer

    Joined:
    Mar 27, 2008
    Oddometer:
    1,744
    Location:
    Penticton, BC
    1600 kms so far, rider is 5'10 @ 170lbs
    no luggage, stock bike
    Daily commute 90-100 kph = avg 4.7L per 100 kms
    Agressive riding, offroad and speeds over 100 kph = avg <6.5L per 100 kms
    (as indicated by OBC and verified by manual calculation with GPS)

    Incidentally, my GPS and speedo/odo are in agreement.
    Overall average has been right around 5L/100kms. Overall I'm impressed, I thought it may be worse!! I'm going to watch that average drop off now that I have the knobbies on though...
    #40