With my normal steady riding I get 60 m.p.g.. With more spirited riding I have had it drop to 55 m.p.g., but with advancing years (me rather than the bike) this doesn't seem to happen quite so often these days.
From a full tank to the gauge showing between empty and 1/4 (and the low fuel warning light coming on) this gives me a range of 200 miles. FZS600 2001 model.
I did push it to 225 miles the other day by which time the gauge was nearly on empty.
I've never managed to get more than 17 litres in at fill up, so maybe "Fazerider" is braver than me when it comes to running low on fuel
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Probably of no great interest, but there is 1.5 ltrs of fuel in the bottom of the tank that can't be used. On my bike with 5 ltrs of usable fuel in the tank the gauge shows just under 1/4. That's with the bike level and stationary, so maybe a bit different when on the move and the fuel is jiggling about.