I bought this used at 34000 miles. I now have 49000 miles and it only gets 15 miles per gallon in the city and not much better on the highway. It runs great, idles great, no smoke etc. I just replaced the tires 3 months ago and this has not helped.
I ran my finger around the inner portion of the exhaust pipe and there was black soot.
Would just replacing the O2 sensor fix this or should I replace the plugs, cap and wires as well?
I only use Chevron gas.
Any help would be appreciated.
Thanks so much!