Fuel consumption ?

[John Mc Bride]

Having recently purchased my Max I notice that the fuel warning light comes on after 90 miles is this average or should it do more ? The bike has a K&N filter and splitfire plugs fitted (by previous owner) how can I tell if the bike has had the carbs rejetted ? get more MPG ?  Th bike runs real good, very smooth and very fast but I have heard of people getting over 40 MPG is this true ? I would be interested in any advice that would assist in the increase in MPG as here in the United Kingdom petrol is very expensive and MPG is a major issue rather speed.   Thanks,  John.