I have a 2003 Eddie Bauer 4.6L 4x2.

I was getting 18.9 MPG highway when I started.

Now, 75000 miles and one new set of tires later, I am getting 16.5 MPG highway.

I am seeing a mechanic tomorrow.

What should I have them do to restore my MPG?

- replace Sparkplugs?

- replace Wires?

- Adjust timing? (car has slight ping when accelerating)

- Air Filter (it was replaced several months ago)

- Clean fuel injectors (I am assuming I have these)

- rear pinion gearhas been replaced twice due to Ford TSB (and it sounds a littlebad again. Can this affect MPG?)

- other?

I have not had my wheel bearings greased, but all other service items have been done to schedule. Canbearings affect MPG?

Many Thanks for your advice

 

Replace plugs, wires, air filter, fuel filter,clean injectors,and cleanMAF/ACT sensors. Timing is not adjustable. Slight ping under load is normal, however an increase in pinging could be a sign of carbon build up in the cylinders or vaccum leak(s).

How long ago did you get the tires and when did you notice your mileage dropping? Type/MFG of tires can also affect mileage. I lost 2 MPG on my 97 Sport going from the Firestone Wilderness A/T's to the Goodyear Wrangler RT/S's.