has anyone used a computer reprogrammer to get better milage? if so what kind?

 

I have not tried a programmer but there are a lot out there to choose from. Try this thread from another site. It may help.
Programmers - Ford Expedition Forum

 

There is also an entire forum dedicated to tuners/programmers here:

Computer Chips & Tuners - Ford Truck Enthusiasts Forums

 

Are the tuners as effective on the 99 and up Navigators with the DOHV (32 valve) engine?

 

I suspect that you can tune any motor. I have seen these things used on 4 cylinder engines and even motorcycles. The key is finding one that does everything you want for a good price. Just remember that you need to up the preventive maintenance if you are working the engine and transmission harder.

 

I'm not sure if Power Hungry Performance - Phoenix Multi-Position Chips would work or not, but you could post a question on their forum.

 

Absolutely.

https://www.ford-trucks.com/forums/5...ak-update.html

JL

 

i use and xcal 2. can't speak for mileage though. last tank was 7mpg.