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easy mods
At 125k miles you are overdue for changing the rear end lube. Replacing this with a good synthetic gear lube will make a measurable difference in mileage. (hypoid gear sets have lots of friction)
Motorcraft 5w30 synthetic blend oil (really cheap at Walmart) in the crankcase should help a little too.
If your cooling system fan doesn't have a clutch, then adding a fan clutch adds a little bit to your mileage. Of course you could always add an electric fan, but that is much more involved than simply adding a clutch fan setup.
I second setting the air pressure in your tires higher than the Ford recommendation. My personal vehicles are usually set 10% higher than the manufacturer's recommendation, but some people go even higher.
Good luck with your car!
Wayne
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