Checked fuel pressure. 50psi at idle and the pressure would rise as I gave it gas. i removed the vaccum reference from the regulator and the pressure immediately went to 60psi. So, I don't think its a fuel problem but this doesn't explain the reduced fuel mileage.
Checked the alternator wires and looked fine. The volt gage always reads around 14v. Never seen is fluctuate.
The truck seems to running better but not 100%. Maybe I got a bad tank of gas. The tank it ran the worst on was 93 octane Chevron, where I buy from often. Wonder if since the economy is not so good these days no one is buying 93 and the gas is going sour.
cleared the dtcs and will check later today.