My Bosch 02 and plugs are holding up well so far. Now that the warm weather is here I'm getting 19 mpg and 27 highway. I am concerned that the Delco Ign. is going to cook the plugs.
I have found that the new cleaner formula of gas was dragging my numbers down so I am adding a fuel saving additive that works well.
It is organic and coats the molecule of the fuel to make a super clean burn guranteed to pass any emission test.
At 9 mpg you have a major fault in the fuel and air ratio.
Add fuel injector cleaner and remove the 02. If the tip is black its shot. Clean the MAF with a Q tip and alcohol.
Procede to do all the normal tune up changes (filters, pcv, etc.) and see where this takes you in mpg.