I installed a ScanGaugeII in my georgetown this week. It's an engine monitor that plugs into the OBDII port and tells you all kinds of great information. Install time was only about 10 minutes. It just plugs into the port and then you double-sided-sticky-tape it to the dash and you're done. About $160 at amazon. I've taken one drive with it and I love it.
You can also program it for a lot of ford specific data. I've tried a few of those and so far all the ford specific items I've tried have worked.
It has a trip computer so it'll tell you things like; Distance left on current tank of gas, time to empty. And for the current trip, or the current day, or the previous days it'll tell you things like; average MPG, maximum water temp, fuel used, maximum speed, etc etc. You reset the trip info in it at each fuel fill-up and tell it how many gallons you put in, so it adjusts itself and gets more accurate over time.
While you're driving you can also monitor all kinds of stuff, a short list of things it will display just from my memory;
Fuel remaining (in percentage of tank)
Outside air temp
intake air temp
total engine hours
throttle position (in percentage)
current load on engine (in percentage)
current horse power being made (just a guess on it's part)
and lots more that I don't remember
It'll also read error codes stored in the engine computer (service engine soon light codes) and it will clear those codes and turn the light off for you.
Also, Also it's possible to do some horse power tuning with it, but I haven't tried that. And it'll record 0-60 times and other performance data, but I haven't tried that yet either.
Amazon.com: ScanGauge II Ultra Compact 3-in-1 Automotive Computer with Customizable Real-Time Fuel Economy Digital Gauges: Automotive
ScanGaugeII : Linear Logic - Home of the ScanGauge