HELP ME SOME ONE problem with my corrolla

i have a 99 corrolla CE. my problem is with my engine. it all started when i started hearing my engine had a very loud noise when i go over 40 mphs. then i checked the oil and thier was almost all gone. so i replaced the oil in it. now the noise is still thier everytime i go over 40 mphs. and it sounds like a buzz of helocopters. anyways ever sinse i changed the oil for some reason my gas gets done pretty quickley. even if the gage is on Empty the light doesnt show up. is it becuse thier is gas left and the gas is just moving around in the tank and it cant get a accurate reading or what. anyways after that as well my oil in the tank also seems to finish quickly i have to ad more oil every 3-4 months. Can anyone tell me what is the problem with my engine and gas and oil. cuse mechanic said its fine its just proably cuse it didnt have enough oil in the engine. can some one pls help me pls

Well first oyu need to give me an approximation as to your milage per tank-full of gas. [use the trip odometer]. Secondly, how many miles before you have to add a quart. Time elapsed don't count. It's milage. The noise may be a motor mount or a deffective tire. Does the engine also make noise when in park when rev'd?, or just when rolling?

okay ill do that ill fill up my gas tank right now and ill let u know. no the engine doesnt make a sound while iam parked. its quite. let me know what else i need to do or what else u need from me. thanks man