Fuel Range After 'empty' Reading

Discussion in 'Triumph General Discussion' started by brown mouse, May 22, 2020.

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  1. brown mouse

    brown mouse Senior Member

    Sep 15, 2018
    529
    143
    East Midlands, UK
    Returning home yesterday, satnav said I had 12 miles more to go than bike said I had fuel for. As I've started to carry extra fuel in a can, I thought I'd try pushing my luck. I didn't spare the throttle on the mostly fast country lanes and I still got to the petrol station 12.5 miles after bike said I had no fuel range left; bike ran fine during that time. I filled up with 11.7 litres of petrol and by my calculation from MPG figures, my extra 12 miles used 0.8 litres, so 'no fuel range' indication came on after 11 litres used. My Bonneville Speedmaster has a quoted tank capacity of 12 litres, though I don't know if that's meant to be 'usable' capacity, or actual capacity. I suspect latter, in which case the fuel pump would have been slurping the last dregs.

    Thought I'd mention this here as I expect the fuel system and gauges in a lot of the modern Triumphs is the same and my experiment may be useful to other people.
     
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  2. Privateer

    Privateer Stand up member
    Subscriber

    Jan 2, 2017
    1,293
    1,000
    Derbyshire
    I have no idea if it's intentional, but I'm guessing that the manufacturers err on the side of caution. I'd rather have a bit left when it says empty, than be empty when it says I've got a bit left! :)
     
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  3. Wessa

    Wessa Cruising
    Subscriber

    Apr 27, 2016
    6,462
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    North West England
    I also think that the fuel gauge is only intended as a guide and they are not that accurate. :)
     
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  4. Duckadiledundee

    Duckadiledundee Peasant First Class
    Subscriber

    Jun 24, 2019
    4,263
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    High Peak
    I get 125 mile range from a full tank...fuel warning light comes on at 115 miles...I expected a bit more than that but it is what it is...
     
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  5. brown mouse

    brown mouse Senior Member

    Sep 15, 2018
    529
    143
    East Midlands, UK
    I was surprised that my bike's idea of distance was so accurate. After a recent 100 mile or so ride when I tested this, the trip meter and my satnav only disagreed by 0.1 mile.

    From day one, I already knew speedo was spot on compared to satnav and roadside speed displays you see. That took some getting use to, as I'm use to them reading about 10% over, a difference that's important when there's speed cameras about!

    I think the bike's idea of MPG is pretty good too, on next run I'll do some experiments to check fuel usage accuracy,

    You may have guessed I'm a bit of a nerd :)
     
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