If a noticeable fuel increase has occurred lately then it is probably the fuel injectors blocked or leaking a very fine mist of fuel when cranking engine, but when engine gets hot it expands slightly stopping the leak if this is the case fix immediately risk of fire extremely high in this condition .check also the whole fuel system and use your nose rather than looking for leaks petrol evaporates almost immediately when in small amounts leaving not much visible trace on surfaces .have someone crank the engine and look and sniff from a fairly safe distance at the engine, whilst they do that about 3-4 times in short bursts otherwise you will paralyse the battery.!!CAUTION!! DO NOT undo fuel injectors or touch them while cranking or running the engine because the petrol is in a highly fast jet it can penetrate your hand (fatal/)in some cases!!!and a fire risk/certainty!