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Carry a one gallon jug of fuel with you and drive til you run out. Note the mileage on your tripmeter, put that gallon of fuel in the tank, and go fill it up. Add the gallon of fuel you put in to your tank to the fill-up total and you'll have a rough idea of actual capacity. The noted tripmeter reading will give you approximate mileage/tank. It's sort've a pain in the neck, but it will give you data that you will use for the life of the bike. I don't ride a 1400, but I'd say that bike could easily travel 175 miles on a single tank...
Unfortunately, mileage will vary with conditions, so it will be no guarantee.....
I ran mine to empty once on purpose, with spare fuel on board, and once heading for fuel on a cold, dark and wet night (with spare fuel on board). Both times the bike had gone 75km from when the fuel light came on. Stephen
I have put about 3.5 gallons in it after riding 25 miles on reserve warning. Book says 5.5 gallons. I'm getting the feeling that some of that may not be usable fuel.