| Never seen any, and probably highly unlikely the way the tank extends under the seat.
When you mention tank range are you just going of the fuel gauge which is notoriously pessimistic, often starts flashing empty at less than 100 miles but you still have about 7 to 8 litres left then.
It is very annoying but i deliberately ran mine dry once to find out before i did my John O'Groats to Lands End, and Sahara trips because i needed to know and couldn't trust the gauge. The problem is because the tank is so long and extends under the seat so even when the gauge reads empty there is actually a lot left in.
I work on the principle of fill up around 150 mile mark irrespective of the gauge and this still leaves some in reserve.
If the fuel light comes on before 85 miles then i've been thrashing it and may fill up a little earlier than 150 miles. | 
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