Thread: Terrible MPG.. Any suggestions?

My guess is tune up time and maybe o2 sensor time

If you are really getting 13 mpg that is awful. Be aware that changing your rims ( wheel OD) will change the DIC reading without properly adjusting the PCM.

That being said, here is a list of tune up items.

1) Front O2 sensor replacement
2) Spark plug replacement
3) MAF cleaning
4) Proper tire inflation (30psi bare minimum, I personally recommend about 34 psi when checking a warm tire)

If you address these areas without a change, the problem becomes a lot harder to find. Because then it could be any of a long list of insidious problems.

Good luck