Bad Fuel Mileage on New 2017 F800GT - BMW F800 Riders Forum & Registry



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  1. #1
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    Hi,

    I have recently got the new 2017 F800gGT having previously had a 2015 model. On the 2015 I was getting 120 miles to half a tank but on the new 2017 I'm only getting 90 miles to half tank - can the new updates they havedon to the exhaust and engine really make that much difference???

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  3. #2
    FrankV's Avatar
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    Not very likely. Measurement on "half a tank" seems pretty inaccurate to me. What does your on board computer indicate?
    A more accurate mileage number can be calculated only after a few fill-ups.

    2013 F800GT Valencia Orange 

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    WildWilly's Avatar
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    What Frank said. On a new bike I don't check fuel mileage until I have 1,000 miles.
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  8. #4
    Elgin, Scotland ST404 is offline Volunteer Moderator - GT
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    At 120 miles to half a tank you would have a full to empty range of 240 miles which is well in excess of the norm (you would be averaging 72.7 mpg). Your currently averaging 54.5 mpg which is actually quite good for a new engine

  9. #5
    notacop is offline The original Schwartz Wald Troll
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    A variiation in the sender could skew your imagined use. Run the bugger dry, add half of what the book says it should hold and see what the gauge indicates. That wiuld be real 1/2 tank.
    Give the bike time to break in and you getting used to how it really works.
    I usually got great mpg during a break in cus I was ringing gently.

  10. #6
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    I think the only way to get a decently accurate fuel consumption figure is to log several fill-ups and mileage since last fill-up. The style of riding needs to be consistent for this to be reliable. Have you tried fuelly.com?

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    Thanks for all the info.
    I have done 560 miles and run in according to book.
    The thing is that on the old 2015 bike when I filled up at half tank it took around 7 litres and 120 miles the half fill on the new bike is also around 7 litres but only getting 90 miles. I don't ride new bike any different to old bike and would have thought that while I was taking it easy running in that would at least equal if not increase the mileage. I know gauges are not that accurate which is why I take note of the amount of petrol I put in. Will take it for a run and see what computer says - when the weather stops bloody raining cause on the old bike it was saying average of 63 mpg.

  12. #8
    FrankV's Avatar
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    The fuel level indicator of the bike is not very accurate and may differ from bike to bike. Best way to calculate the mileage is to note odometer value and amount of fuel for a number of fill-ups. E.g. use the Fuelly app, as suggested by Futterman. Or look at the mileage indicator of your OBC. What does this say?

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    I agree using the fuel gauge is useless. That only accurate way to determine fuel mileage is to use your tripmeter to determine riding distance between the last fill up and divide that by the number of gallons or liters that you needed to refuel your tank since resetting the tripmeter. Math is your friend - not motorcycle fuel gauges.
    Richard - Current bikes: 2016 BMW R1200RS, 2018 16.6 kWh Zero S, 2011 Royal Enfield Bullet 500 Classic, 2009 BMW F650GS, 2020 KTM 390 Duke, 2002 Yamaha FZ1 (FZS1000N) and a 1978 Honda Kick 'N Go Senior. 

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    I am using the trip meter and as I said 7 litres on the new bike is around 90 miles where as on the old bike 7 litres is around 120 miles

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    @gingerb (and is that the actual Ginger B or a fan?):

    At anything less than about 1200 miles my bike still felt "tight" in terms of slightly clunky shifting and less impressive fuel mileage (sorry, don't recall exact numbers). But my point is that these bikes seem to take longer to break in than some.

    -dan
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    [QUOTE=danham;2542209]@gingerb (and is that the actual Ginger B or a fan?):

    Hahaha had no idea there was an famous Ginger B - sorry to dissappoint

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    [QUOTE=gingerb;2542777]
    Quote Originally Posted by danham View Post
    @gingerb (and is that the actual Ginger B or a fan?):

    Hahaha had no idea there was an famous Ginger B - sorry to dissappoint
    http://www.gingerbaker.com

    -dan
    Blue '09 F800 ST: ABS, toasty grips, trip computer, center stand, sport panniers, Ventura luggage, Valentine 1, Garmin zümo 660 RAM mounted, Sena 20S, P3 LED tail lights, Grip Pups, Centech AP-1 fuse panel, Go Cruise control, Shoei GT-Air, Gerbing's jacket liner, MRA X-creen Sport. 

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    OMG think I saw him play at Ronnie Scott's in London when I was a kid

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    There's a good documentary about him and his retirement in South Africa. Weird guy, aggressive but brilliant.

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    Apologies for more OT, but GB is a hero of mine and arguably one of the top rock and jazz drummers of all time.

    https://itunes.apple.com/US/movie/id596207398

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    Dan knows of what he speaks. From a jazz perspective, we would be remiss if we didn't also include:

    Art Blakey
    Peter Erskine
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    Tony Williams
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    Because of the ‘half fuel-tank gauge,’ I would think it impossible to get any sort of accurate reading using indication on gauge. Can only do full fill-ups and note miles (Km) and gallons (L) on next fill.

    My personal experience, with a ’15 model.

    Gentle run-in according to book, first service at 603 miles. Continued gentle riding, with gradual increases in RPM, on occasion, and only when very warm.

    Initial mileage was consistently about 40+MPG, city driving with lots of up and down shifting. Some hills, but not much to speak of. Mix of freeway, city and rural highway.

    After 1600 miles and more highway use, getting roughly 50MPG in town riding and 60MPG on the freeway. The latest freeway riding was a lot of 70+mph areas that are terrible for fuel economy. Mountain pass, lot of elevation change and long hard hill climbs. Very happy with economy.

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  28. #19
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    Ok I've done some calculations - according to the on board computer I'm getting 68/ UK gal, according to my own calculation it is actually 64.87 / UK gal both are in mymind pretty good for an 800cc.
    I have a theory as to what is happening and causing the 30 mile difference between 2016 machine and 2017 one - the tank is 15L with a 3L reserve (according to manual) I'm thinking that the computer ont the old 2016 model did not take the rexerve into account whereas the new 2017 bike computer does - is that just wishful thinking or does it make sense
    Anyhow I am taking the 2017 demo out for the weekend to do a comparison so watch this space.

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    I reset the trip meter every petrol stop and fill it to the brim. I sometimes divide the miles by the gallons and WALLA, I get an accurate mpg every time. Averages 52mpg (UnitedStatesian)
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  31. #21
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    Quote Originally Posted by gingerb View Post
    Ok I've done some calculations - according to the on board computer I'm getting 68/ UK gal, according to my own calculation it is actually 64.87 / UK gal both are in mymind pretty good for an 800cc.
    I have a theory as to what is happening and causing the 30 mile difference between 2016 machine and 2017 one - the tank is 15L with a 3L reserve (according to manual) I'm thinking that the computer ont the old 2016 model did not take the rexerve into account whereas the new 2017 bike computer does - is that just wishful thinking or does it make sense
    Anyhow I am taking the 2017 demo out for the weekend to do a comparison so watch this space.
    The difference you found is below the level of error in the whole system. Among the places where error creeps in: plastic fuel tanks can expand and contract with temperature, to the tune of about a liter (in a car), according to Car & Driver magazine. Fuel flow is calculated various ways by on-board computers and we have no way of knowing exactly which measurements are being taken inside that "black box." Even assuming perfect measurement, the computer then averages, throwing out absurd instant readings, such as 300 mpg when coasting down a long hill in 6th.

    You get the idea. If you want precision (or something close to it), you need to fill up with the same brand each time (fuel density differs by brand and season), preferably at the same pump, ride on days with similar weather, and cover similar terrain for each tank. Or just be content with a rough estimate, like most of us.

    -dan
    Blue '09 F800 ST: ABS, toasty grips, trip computer, center stand, sport panniers, Ventura luggage, Valentine 1, Garmin zümo 660 RAM mounted, Sena 20S, P3 LED tail lights, Grip Pups, Centech AP-1 fuse panel, Go Cruise control, Shoei GT-Air, Gerbing's jacket liner, MRA X-creen Sport. 

  32. #22
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    yup, variable, on occasions I have had 170 before orange warning light coming on and on others, like previous weekend, 145, I rode another 25 miles (UK) before finding a garage and manage to put 14.6 litres in the tank... not sure how far the remaining 0.4 litres would have got me, but not far!!

  33. #23
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    That fuel consumption sounds pretty much spot on. UK gallons are larger than US, hence the differing numbers being talked about.
    My last GT averaged 65.5 mpg averaged across its entire 11000 mile ownership.

    Are you the same Ginger, as the LancsBiker forum?

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    I'm still getting 68-70 mpg on my '13. Filled up this morning after riding 215 miles. It took with 3.03 gallons, with three bars still showing.


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  35. #25
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    .

    Are you the same Ginger, as the LancsBiker forum?[/QUOTE]


    Hi there - yes I am that Ginger

    OK all calculations now done with demo bike - that is getting 68.69/mpg (uk) whereas mine was getting 64.87 mpg (uk) so a difference of around 4mpg. This sounds about right to me as demo bike has done over 2000 (obviously a popular demo) whereas mine has done around 600 so I may get a bit more when it's fully run in.

    By the way has anyone tried the new BMW 310 - I took it out when mine was having 1st service - most fun I've had with me clothes on for years

  36. #26
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    Quote Originally Posted by gingerb View Post
    .

    Are you the same Ginger, as the LancsBiker forum?
    Hi there - yes I am that Ginger

    OK all calculations now done with demo bike - that is getting 68.69/mpg (uk) whereas mine was getting 64.87 mpg (uk) so a difference of around 4mpg. This sounds about right to me as demo bike has done over 2000 (obviously a popular demo) whereas mine has done around 600 so I may get a bit more when it's fully run in.

    By the way has anyone tried the new BMW 310 - I took it out when mine was having 1st service - most fun I've had with me clothes on for years [/QUOTE]

    The two G310 models (R and GS) are not due to arrive at U.S. dealers for a couple more months. When they do arrive, I'll give one a test ride.
    Richard - Current bikes: 2016 BMW R1200RS, 2018 16.6 kWh Zero S, 2011 Royal Enfield Bullet 500 Classic, 2009 BMW F650GS, 2020 KTM 390 Duke, 2002 Yamaha FZ1 (FZS1000N) and a 1978 Honda Kick 'N Go Senior. 

  37. #27
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    I think you will find a significant improvement in fuel consumption after first 6,000 miles.
    My 2013 GT is at 32,000 and yesterday, during a 260 mile ride in Lancashire,Yorkshire Dales & County Durham [only 10 miles on motorway] the OBC was indicating 78 mpg !!! I use 97 RON super unleaded fuel.

  38. #28
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    Quote Originally Posted by emlevy View Post
    Dan knows of what he speaks. From a jazz perspective, we would be remiss if we didn't also include:

    Art Blakey
    Peter Erskine
    Buddy Rich
    Tony Williams
    Connie Kay
    May I add to that distinguished list:
    Gene Krupa
    Tito Puente
    Max Roach
    Elvin Jones
    Jack DeJohnette

  39. #29
    emlevy's Avatar
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    Yes! Thanks Mark!


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  40. #30
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    I thought the fuel indicator of the F800ST was also unreliable. But I now think it's great, if you know how to make the best of it.

    My experience with the F800ST is that the remaining range indicator is the indicator to use to help decide when to fuel up, not the fuel capacity meter. The reserve light also lights up precisely when there's 4.2L left on my bike.

    I used to put gas as soon as the reserve light lit up but now I'm done with always tanking 11.8 liters instead of taking advantage of the awesome range this bike offers. I now put gas only when I have 40-50km left in range and I have no issues, knowing that what can be done with the reserve fuel varies depending on how and where you're riding.

  41. #31
    WildWilly's Avatar
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    It's rumored that the next version of the GT will show only the top half of the tank.
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