My car is getting about 14 mpg. Cruising on the interstate at 62mph it gets a little less I think.

Here is what I have done:

Rebuilt the head
New valves, and refinished seats
New guides/ seals
Head was perfectly flat
Intake and exhaust gaskets
Chain guides for timing chain, front seal
Custom cam grind, very mild- probably less than a "euro" cam
Plugs, wires, cap and rotor

Had the EHA and fuel mix reset

About 6 months ago I was getting 22mpg average, no matter how I drove.
The economy dropped off, and oil consumption increased, so I decided to rebuild the head. Pulled it myself, and had a pro do the machine work.

Now, after close to $1000 of parts and several weeks of my free time I cannot figure out why it uses more fuel than an overloaded Freightliner.

There are two things that possibly could help. Injectors and a new O2 sensor. Will these two things, in combination, or alone, cause such a drop in fuel economy?

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