gas mileage problem
 

I own an '03 Elantra gls.. and I've been getting poor gas mileage for the past while. I filled my tank a few days ago.. I've only driven about 50 miles, and already I'm down a quarter of a tank. Any ideas as to what's goin' on??

RE: gas mileage problem
 

From least to greatest check on the following: Oil, fuel filter, spark plugs & wires (distributor cap/rotor), O2 sensors, muffler, & timing belt. I say if you change the first 3 and still are having problems then maybe take it in to check diagnostics.

RE: gas mileage problem
 

Hi to Jlivan. I own a 1994 1.8litre Lantra which is the ame as the Elantra and it does not have a distributor. It has a coil pack controled by the computer. I think this setup is standard. Did Hyundai change back to distributors in the later models?

RE: gas mileage problem
 

bad oxygen sensor will cause poor gas mileage

RE: gas mileage problem
 

I don't want to scare you, but it wouldn't be the first time, that a tank has shrunken to half size. A friend of mine had this problem with his Opel Corsa and it must be an issue every now and then with many brands. Not only Hyundai.

RE: gas mileage problem
 

Definitely oxygen sensor or plugs and wires. My mechanic said it is very rare for a fuel filter to go bad. I changed my Ox sensor at 80,000 miles, big difference, changed plugs and wires twice, big improvement.