I was driving my mothers 08 king ranch expedition (2wd) the other day and it was getting 16.3 driving around town. I reset the mileage when I got in, my truck barely gets that on the freeway!

 

Does a tranny flush really affect these trucks that much? I can understand a little, but not 3-4 MPG. I might want to get a tranny fush in my truck.

 

One of the best ways to help yourself with fuel economy and power output is to put an "Engine Vacuum" or "Boost Gauge" that is readable from the driver's set. Mounted either on the column or center console. What!?

Yes!. For any given condition of you engine, fuel economy you can help yourself by not "over applying" power for a given condition. That is what knowing your exact vacuum reading or trend can help you out with. Example if you purchase one and mount it as described try driving with the cruise control engaged to see where your present system works best at. That will be your initial "bench-mark". While driving yourself manually adjust your driving parameters to keep the gauge meter reading the same or similar. After some time you will notice that you can save a significant amount of fuel under load keeping your readings under 17 or as far to the left on the gauge as necessary.
Try it. Most vacuum gauges don't cost more than $45.00-50.00 and you may see an immediate improvement. That being if the cost of fuel levels off while you are doing your test.

 

great info where do u get these gauges, and how do you install them?

 

well i found my problem my vss sensor was failing changing my shift points went from 10 mpg to 14mpg

 

I recently purchased a 04 Expedition and am getting around 13mpg with a 40 mile commute (Not Stop and go, but not highway either). Also I run my Expedition in AWD all the time.

I been looking at ways to increase gas mileage, what I have found but not proven are:

Better Lubricants, I am a huge fan of Royal Purple and am in the process of doing a complete Purple swap.

More Air - Cold Air intake is listed as the best, I switched to a K&N.

Tires - a Free Rolling tire that exhibits less resistance from the road. (I don't even know if these are available in "Expedition Size"

Exhaust - There are claims better exhaust will increase mileage, however most people tend to get in the gas more to hear that rumble and counteract any benefits.

More Spark - e3 spark plugs have some impressive data as well as some of the other premium plugs for increasing gas mileage and power.

- Granatelli offers a Coil over Plug that guarantees 15% increase in mpg or your "Money Back". At 255$ I'm not sure when that would pay for itself.

Fuel Filter replacement

- The biggest difference I saw listed, in various places, is a computer reprogramming device.

In the end the cost of these upgrades might outweigh just paying crappy gas prices. However the added benefit of more HP, longer service intervals, and less wear and tear on your vehicle make them worth it.

I will be doing these changes to my own Expedition over the next 6 months. Ill update on any improvements I can see.


Oh I forgot one of the most important factors. Driving style.