to add to drz's list:
- dirty air filter
- Alighment needed
- Always using the a/c or windows down.
- Driving with multiple people or always having cargo in the car.
idk why the 6 cyls are doing better than some of the 4s... u may want to replace/change what drz and I have listed. chaosbunny- in a 318, u need to be breaking 300 every tank...
make sure its not your gauge too... to test it, just fill the car up completely, drive atleast 100 miles (would be best to try and use the whole tank), then fill the car up all the way again and compare the amount of miles driven, to the amount of gas you just put in.
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