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Haaa!Let us know after you try it :grin:

I don't know if this is factual, (but I've always tried to live by it), they say it's best not to run your tank to zero. The thinking is the particles on the bottom have the potential to clog things up.

- 14L tank

- fuel light came on, you rode another 23kms

- how much fuel did the bike take when you refilled it? That'll tell you how close to dead empty you were and then based on your average km/L you can figure out how many more km's you could have ridden ie if you average 10km/L (high but just for comparison sakes) and you put in 12L, you had 2L left so you had 20kms range.

I cannot see that method as working. Fuel light comes on with 50km remaining, so I assume you mean fuel reads zero.

- 14L tank

- fuel light came on, you rode another 23kms

- how much fuel did the bike take when you refilled it? That'll tell you how close to dead empty you were and then based on your average km/L you can figure out how many more km's you could have ridden ie if you average 10km/L (high but just for comparison sakes) and you put in 12L, you had 2L left so you had 20kms range.

Filling the bike is difficult with only a sidestand, and there is no guarantee that the fuel capacity is exactly 14 litres.

The best method I can think of (aside from running until completely out) is to run the bike to zero ensuring you are near home, disconnect the fuel line and then see how much of the remaining fuel the pump can pick up.

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The exact "how far" will depend on yow you ride - and whether you have made engine mod's. Also depends how precise YOUR fuel level sensor is.

25kms past zero is about a litre of fuel based on my consumption (prior to fitting the COOBER). I seem to remember that when I last filled when I was on or near zero (and that was months ago) - the Tank took a whisper over 12.5L. In a 14L tank - that means 1.5L left - If you'd done IL more you had approx 0.5L - maybe 12kms.

My golden rule for the last 40 years has been - "Unless you know exactly where fuel is, have 1/3rd of a tank available". Fuel these days tends to be cleaner - but I have had to clear enough fuel filters to cure me of risking shyte in injectors.

If you often need to ride on the limit - If you ride solo - you could consider a 2L RackPack tank or similar. I doubt I'll ever use my 790D for distance runs - but if I move to the ADV then I'll be looking at that idea, even though they have bigger tanks.

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435 Posts

Though I don't thrash it that much and am really impressed by the economy you can get out of this bike - think my long-term average is around 79 mpg indicated.

I'm not hanging about, just not racing through all the gears constantly.

Times my numbers but 0.8 (from 16/20) to get the US numbers...

UK - 79 miles/Imperial gallon

US - 63 miles/US gallon

Thanks for pointing this out @barbagris

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And they blamed it on evaporation. As an avid rum drinker -Ah yes - both 8 pints, but the UK pint is 20 fl oz while the US one is 16 fl oz

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659 Posts

DMA, that's really impressive. I don't use the bike's consumption number. I calculate the mileage on each tank. I generally get around 50 mpg. I thought that was remarkable.

That's exactly what I was thinking. I get the same (50 MPG), which is awesome enough for me!

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161 Posts

If you ride like me

in the city.

Basically i get to work and home and back again with the light on.

but not home again :0(

There is a theory that running the tank empty isn't good for it as it sucks all the crap in it but this doesn't really make sense. The drain on the tank will be at the bottom, so it's always sucking the crap. Though i guess you could make the argument that it won't suck the floating bits.

Personally i think running the fuel pump dry is a worse thing than crappy bits in the fuel (that the filter will get anyway).

Also, yes the Duke 790 is amazingly light for its class. It was still an arse to push up the hill!

I don't recall any discussion of how long it would take for the damage to occur.

I have run my 790 from FULL to no more go twice , first time =370 km with measured refill being 13.6 ltrs ,second time 360 km 13.65 ltrs , both times were a combo of 30% city and 70% highway travel ,60 kph city and from 80 to 110 kph highway .I cannot see that method as working. Fuel light comes on with 50km remaining, so I assume you mean fuel reads zero.

Filling the bike is difficult with only a sidestand, and there is no guarantee that the fuel capacity is exactly 14 litres.

The best method I can think of (aside from running until completely out) is to run the bike to zero ensuring you are near home, disconnect the fuel line and then see how much of the remaining fuel the pump can pick up.

After low fuel indicated with 1 bar on gauge showing I traveled a further 60k /70k before she no go anymore.

Roymans

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