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  1. #1
    Registered User
    Join Date
    Oct 2016
    New Hampshire

    18 RTW fuel guage/range/tank

    Hi All,
    I'm bonding with my new to me 2018 RT. 'How far on a tank' is always a first thing when I add one to the stable. My experience with this one is a bit perplexing. Fill tank and reset trip #1. Ride. Low fuel lite comes on. Keep riding. Last bar on fuel gauge vanishes. Switch to 'range' on dash info. 40 miles to go. Keep riding. range says 1 mile to go. trip #1 says 295. OK, I give, pull up to pump. 5.5 gallons bring it up into the very top. MOM says I have a 6.6 gallons of usable fuel. Quick math says I got 50.5 MPG. So, do you find the gauge, low fuel lite and range info to be WAY cautious? Did I have another gallon (50 miles more or less)? Thoughts and experience sought.
    BTW--yes, I know, don't run it dry--don't run it low--bad for pump--bad for cat--bad for glass (Chinatown fans out there?)
    61 R27, 64 R60/2, 82 R100RT, 01 R1100RT, 18 R1200RT, 63 Honda CA110, 65 Honda S90, 71 Honda CB350 and many gone but not forgoten

  2. #2
    Registered User lkraus's Avatar
    Join Date
    Nov 2011
    Central Ohio
    Can't say for sure about the '18. My '06 consistently has about a gallon left when the distance-to-empty display reads zero. I consider that my "reserve", it has saved me several times.

    I generally start looking for gas around 250 miles on the trip meter, or when the yellow low fuel light comes on. I never use the fuel gauge.
    2006 R1200RT

  3. #3
    Dress for fall & avoid it AlanColes's Avatar
    Join Date
    Aug 2013
    Bedford, Nova Scotia
    For me, the range is always a matter of riding style on any given ride, from a low of under 250 miles to just over 370 miles per tank with the instrument panel saying 10-zero range left. So I really don't bother to concern myself with the theoretical range except for planning fuel stops on trips. For touring I calculate on 270 miles per tank as very doable unless I expect to be running hard through the mountains and then I calculate 240.

    Even then, it is only occasionally that I ride from fillup to fillup. I tend to stop once in the morning, at noon and perhaps once in the afternoon. I fillup and stretch and find the day goes much easier for me.

    I know there is some range left after the bike says "0 miles to empty" but don't have any need or desire to find out how much is left unless it is an emergency. Modern engines use much finer and more detailed spray patterns, etc., on the fuel-injectors, to achieve the performance and emissions that they do. Sucking the very last bit of gas out of a tank typically means that you are picking up the largest pieces of sediment and crude that are in there and running them through your fuel system. This typically won't cause any issues, but it is opening the door to them and can create a needless problem so I leave that till it might be necessary. YMMV
    Regards, Alan - President BMWONS - BMWMOA/BMWRA/BMWONS/Airheads
    Current: 2019 R1250RT / '06 Ducati ST3s / '91 R100GS / '86 R80RT / '75 R90S / '73 850 & '70 750 Commando Prev: '14 R1200RT / '04 R1150RT / '81 Honda GL1100 / '77 Suzuki GS750 / '73 Norton 850 Commando

  4. #4
    I ran my '14 RT range down to 1 mile. Took 6.6 gallons to fill. I won't be trying that experiment again.

  5. #5
    Registered User kioolt's Avatar
    Join Date
    Apr 2003
    My 18RTW gets about 300 miles to 0 miles left. It shows no bars on the fuel gauge a few miles before that. I have only been able to put about 5.6 gallons in the tank at this point. It is my belief that the low fuel warning happens about 1 gallon to early and that the fuel gauge is also showing a lower reading than actual fuel left. I have talked to my dealer about this when I took it in for service. The service person had it checked. His response was that there were no error codes and that maybe that could change the sensor at a later date if I wanted them to. I will probably follow up on this next year while it is still under warranty.
    2004 R1150RT 186,800 miles , 1991 K100LT 128,700 miles, 1982 R100RT 106,900 miles
    Total 422,400 BMW miles
    The cheapest thing on a BMW is the nut that connects the handlebars to the seat.

  6. #6
    Booger Man
    Join Date
    Nov 2018
    defiance, mo
    Same thing here with my 18RT. I can run it down to zero miles fill it up and the tank will take about 5.5 gallons. One time I took a about a quart of gas with me and ran it to -20 miles . Still didn't run out of gas. Talked to local service mgr at dealer he said they could look into it but most likely would come up with anything. After 10K on the the bike I just play it by ear. No problems so far.

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