2004 Chrysler Town and Country Gas Mileage

Hi
That is a big drop so let's run down a few things
Have plugs been replaced and wires?
Air and fuel filters less than 30k miles?
Injectors cleaned you are close to 60K a major service interval.
Throttle body cleaned ie. serviced at 30K intervals?
Any change in driving habits or another driver?
If no to the above here are some things that could attribute O2 sensors and MAF reccomend cleaning
Mass Air Flow.
Let me know
Thanks for donation

Thanks for the reply..

At 30k, I was getting a cyl #2 misfire OBD-II code and bucking. Replaced wires with a custom set and new Champion platinum plugs. No misfire after that.

Air filter was inspected and changed if necessary every 3k oil change. The one in there now was installed at 46,500 and I verified a few days ago that it still looks clean.

Injectors and throttle body were cleaned 7/24/08 - at 49,699. Not sure the exact mileage this degradation started but the mileage checks I did were at 51,024 and 51,255 which is very close to the cleaning. It was done by the local Texaco Xpress Lube Center.
When cleaning the throttle body, could they have contaminated the MAF (which I recall is somewhere in the air intake stream)?

Can the MAF be cleaned or does it have to be replaced?

I drive mostly trips 5-20 miles with an occasional trip to New Smyrna Beach (145 miles RT), Orlando, or other similar length trips. Annual is around 7k. I am the primary driver (90%) and I don't have a lead foot! The mileage was 19.3 80% of the time. The first thing I thought about was the gas station pumps were not accurate or someone was syphoning gas. I use different stations and the van is in the garage most of the time.

My scanner says the O2 sensors are both ok.

Very possible the MAF may have been contaminated.
Seems to be really close to the inj. and throttle cleaning. You can get throttle/MAF cleaner. Remove top cover to air filter then remove snorkle to intake. Spray area well open throttle to left is MAP and air inlet temp make sure they are clean. If temp has any debris on it that will tell PCM inlet air is cold and richen fuel mix. Check for any air leaks and or vaccum hose. Good luck and let me know if you need any more info

I purchased a can of cleaner, cleaned the sensor then filled the tank.
Filled the tank again today and checked the mileage.
It is now 18.57 (was 14.1) and the power seems to be smoother.

Since the sensor is 51k miles old I ordered a new sensor from the local parts store. If the mileage goes up to the 20.xx I used to get, at these gas prices, I should get my investment back soon.
Thanks for the help..

Hi fjiabarbera
Glad to here milage up it is often very difficult to diagnose with the complexity of the modern car.
New sensor is good idea because they wear and change perameters that set no code but engine operates at less than efficiant.You might consider O2 as that it very responsible for good milage at least on the bank that had the miss fire.
Good luck