poor MPG after tune up

[benner]

You need to check your plugs to see what they look like to give you an indication. Sounds like somebody is synphening off some gas.

Should look as follows

Condition.......................Appearance..............................Outcome

Normal...............White (no color change) with light gray ring......Correct
Overheating........Extreme white with aluminum specs.................Lean
Wet..................Wet or sooty..............................................Rich

 

[Smokin2000gtp]

Do you have any way of scanning your car? I'd still try and clean the MAF and see what happens since commanded fueling is partially based off the MAF sensor.