sudesh

From last month or so i am noticing that my Escalade is drinking more fuel per 100 km. It used to consume 18 - 20 L / 100km and now it has gone to 24 - 25. Any specific reason for this? I recently crossed 120k km on clock. But i think this is not very high mileage as per year of car. Please help me guys. tHanks.