where did my gass miliage go????

[Jayburd05]

SO i have a 2000 celica gt that was getting around 350-370 miles per fill up. Just last week that dropped down to almost 280-300. i did not change anything on the car it just started eating more gas. there have been days where i have parked the car for work and have come out and the gass guage is a whole two levels less then it was when i went into work. have jacked the car up and ran it and dont see any spots of leaking gass or the smell of any. a guy i know who is like a toyota expert said he might know what it is but then decided to not tell me cuz he is mad or something. So im thinking it is a common thing. Any one got any idea's?????? thanks for the help!

[Andrew Liu]

if the level dropped AFTER parking the car, then sombody's stealing your gas.

[Jayburd05]

Originally Posted by Andrew Liu

if the level dropped AFTER parking the car, then sombody's stealing your gas.

i don't think so first its a locked gas cap and second it has done it several times

[angel_rolla]

time for tune up.

[xb2fergie]

I agree with andrew,someone is probably stealing your gas or your tank has a leak.NO other way you can loose gas just being parked with the engine off.

Otherwise,if thats not the case.Then try looking at the air filter and you may have a clogged catalytic converter also??Spark plugs are easy to change on it and can help,but doesnt sound like the problem.Cant tell by not looking at it.

[bionictony]

does your car have high mileage? check air filter and oil. check spark plugs and maf sensor. i have a 2000 celica with auto transmission and 55,000 miles on the car. i can easily do 420-450 with 1-2 more bars left. (fuel gauge has 20 bars total). when the low fuel light comes on, that's when there's only 1 gallon left. I do about 34-36MPG all the time. This is with 70% highway 30% city in Los Angeles.