ive had my honda civic for about 2 months now and recently(last 300 mile) the gas mileage has dropped from my typical 32 down to 25 mpg. i do have some problems with my exhaust and i recently got an oil change. can ne one help me?

 

What is the problem exactly?

 

The only things that I could think of that would affect milage would be getting a tune up, change your air filter or checking your tire pressure.

 

When's the last time you changed your fuel filter? Also you might want to check and see if your injectors are clogged.

Im not quite sure but I've heard bad oxygen sensors cause bad gas mileages too.

 

my milage gets bad when I need a valve adjustment. As suggested before, get a tune-up and check your tire pressure.

 

agreed with white N slow, both of those help immensely. Also check brakes for drag.

Now if you have a blocked exhaust or a huge leak, that will also make it decrease.

 

Also realize it's much colder than before. That will affect your mpg.

 

I don't know if this is true or not, but i heard that starting this winter that some kind of perservatives would be added to the gasoline to make it more unfreezable or something, either way adding this would lower its combustion making less gas mileage for all. I think it makes the gas cheaper to because it thins it out to make more out of less.