Gas Mileage is deplorable

[93GTDIN]

I get 10 mpg mostly highway miles.

I am getting sick of coughing up 20 bucks every 4 days for gas.

I have replaced EGR, O2 sensors, and IAC valve in the last 2 weeks.

These have made no difference.

Idle is still bad in neutral, but fine when in drive with A/C on (doesnt surge then). This may be unrelated, but i figured i'd provide all possible information.

I'm all out of ideas and i'm ready to stab myself with a fork.

A/f Gauge reads lean/stoich most of the time

Pings up hills in hot weather

fuel pressure set at about 35 psi at idle

vacuum is 10-11 in hg at idle in gear

timing is about 18 degrees (ish)

car stalls when I put it into gear when warm.

Is my cam to much for the automatic? (TFS Stage 1)
Specs:
* Advertised Duration: 275 intake/279 exhaust
* Duration at .050 in. lift: 221 intake/225 exhaust
* Gross valve lift: .499 in. intake/.510 in. exhaust
* Lobe Separation: 112 degrees

Please help me, i'm losing my faith in ford!