What kind of gas mileage do you get? I am very concerned about mine.
Today I used the last gas in my tank (except some of the empty reserve) and calculated my gas mileage. I was shocked when I found out I am getting 9.2 mpg. My grandfather, who gave me the truck, says he got 16 mpg when he drove it. I read online that I should be getting ~17 mpg (I forget the exact figure). I recently replaced the air filter, I have new spark plugs and cables in, and a few months ago I replaced the fuel pump and filter. The oil was replaced recently too, with a new oil filter. I have used Techron off and on, as well as Chevron gas with Techron in it whenever I can get it, to try to clean out the fuel system. What else can I do? There are no error codes and no check engine light, no leaks dripping on the ground, nothing. I am considering getting a locking fuel cap, just in case someone's siphoning it out at night (highly unlikely, but possible and cheap to fix), but I am pretty sure this is an issue with the fuel system. The ECU (PCM, whichever you call it) was reset when we replaced the fuel pump a few months ago, so it should not be the problem.

I have run out of ideas of what it could be. I have never gotten good power going up hills and I have never gotten up to nor over 200 miles on a single tank of gas. The car idles fine, about 850-1100 rpm, and rarely gets to or above 3000 rpm.

The truck is a 2002 Ford Ranger XLT Super Cab 3.0 liter V6 with automatic transmission and 2WD only. It has a gas tank capacity of 19.5 gallons and 94,282 miles on it.

 

Have you checked for leaks?

Edit: nevermind - I didn't see that part of your post...

Have you cleaned the MAF?

 

How do you check your mileage? Do you fill it up then divide miles driven by gallons used? What's your driving style compared to your grandfathers?

 

Because Im not clear from your post (and someone else posted something similar with a weird method for figuring it out), are you calculating it properly or just guessing by where the gauge reads? DONT TRUST THE GAUGE, I always refill at the 300 mile mark because of this.

 

If you really want to be accurate fill up the tank to the first click and stop, drive the truck and fill up again using the same pump every time and only to the first click. Try and do it close to the same time of day and about the same outside temperature. Use a GPS to figure the actual miles traveled. Calculate your mileage off of that so you're as accurate as possible and do it 3-5 times to get a good average.