I have a neon 2.0 with an auto transmission. Lately the gas mileage is getting bad. I have changed the plugs, air filter, oil. What else should there be checked? I cannot find any leaks.....

Thanks,

 

A lot of us have the same problem and we're not sure what it is. I too have kept up with the maintenance and still suffer the same. I don't know what gas mileage your getting specifically but if it's 20< then I'm probably there with you.

I've heard the IAC's go bad amongst other things...no definitive fix for the mystery mpg

 

well it all depends on your driving style. If i drive "grandma style" i could probally get 25. But usually i get 18-20mpg

 

Check the vacuum hoses for leaks.

 

We "might" be able to drive 180 miles with a tank of gas. We have changed all the normal items, such as plugs, oil, coolant, etc.

Could a bad power steering pump be a cause too?? I need to replace because it seems that the either the pulley or the pump is going out.

 

make sure your tires are inflated too. What are they supposed to be at? like around 35psi?

 

I don't know what exactly mine is but its pretty bad, I think im at 20 mpg at the most. I have to fill up every week, and I only drive 10 min to work.

 

I drive slow and shift at 3000RPM. Tires are 39psi in front and 43psi in rear. Car is always empty, and I use 94 octane. I get about 25 MPG. Gotta change my plugs and wires soon, as well as a plethora of fluids.

 

I know this is old but did you recify the problem? Scary when gas is $3.70 a gallon. No MIL codes, car runs/starts idles fine and there is no smell of gas. Thought the sending unit plug broke again but no.... It's scary to watch your gas gage drop so fast. Almost more economical to drive a V8. I drive like an old lady too.
I'm driving 100+ miles a day. Typically I could do that on 1/4 of a tank, now my Neon uses over 3/4 of a tank!
Going to try changing plugs.

 

The big thing is how much idling do you do. I usually get 29-31 mpg in the summer, but I let mine warm up quite a bit and also use it on the construction sites as a "hotbox" to keep socks and gloves dry in the winter. Sometimes it idles 8-10 hours a day. My winter average is about 22 mpg. 2003 auto w/255,000 miles. I do run premium gas WITHOUT any ethanol as much as possible