ive done a search but not found anything similar so be gentle if its common

ok ive only had the bike since january so havent rode it much but filled it last week pretty much to the brim then rode it this week when its been nice round town mainly, just as im getting used to it, anyway the fuel light came on and it only had 54 mile on the trip,by the time i refueled it had 64miles i filled up and got 12 liters in, it seems low to me coming from il4's but what do you guys think. it has termi full system and race ecu.(not sure about air filter)
any thoughts would be much appreciated.