A. I have a Superchip! Get 18+ MPG!

B. I have a K&N Gen II. Get 18+ MPG.

D. I use 93 octane. Get 18+ MPG.

E. I don't drive easy, IMO. Get 18+ MPG.

G. How do you know they're "old"?

Get 18+ MPG. "MIGHT see" 19+ MPG ... after I install my Underdrive Pulleys.

BTW, my mileage has **increased** ... since I've **added** the above parts (See signature for more "add-ons".)

 

well, I will try to respond to all your thoughts in one post. I bought the truck used, but it came with the factory ORP package so the 265/70R17 tires (I believe thats the size) are from the factory. So I am pretty sure the odemeter was set for this size, but I could be worng.

As for all the 86ing. We all no thats no gonna happen so I will leave it at that. I am not in the habit of throwing money away.

Not sure on the type of fuel for my area. Makes sense though. It could be the cause of the problem.

The plugs are Motorcraft paltinum tipped (same as stock) and not even 6 mos. old.

Area is pretty flat.

There is some idleing...in town traffic getting to highway. not much.

Synthetics...never new they made such a difference. I will switch over oil at next change as well as differential. It should be due.

Tire pressure is 32psi in the rear and 29 psi in the front. per door sticker

At least I'm not the only one living at the pump. Oh well...guess it's the price we pay for driving our vehicles.

 

Just to add my 2 cents, I to have had terrible mpg, but mostly due to driving habits. On a past trip that perfectly used exactly one tank of gas, all highway miles, I got only 308miles out a full tank, working to be only 14.7mpg. My driving habits consisted of driving 130km/h, with lots of passing(WOT). Next tank of fuel, I decided to tone it down a hole lot for city driving, and see just how much I can get out of tank in the city. Keeping the rpms under 2000, and limiting my WOT urges I was able to get only 8miles less then I did on the highway, which is about 14.2mpg. Typically the differences between city to highway mpg is about 2mpg, so I should be getting around 16.2mpg on the highway which I consider fairly good. BTW, I factored in the 10% correction for the oversized tires also.

 

Just a thought on your comment about your tire pressure......

You have them at the recommend pressure on the door sticker. Mine says the same thing, but my tires show 50 lbs max. I think they were pumped up to 40-45 lbs from the tire store after I got them. I run them at 45 lbs all around. Mine are LT tires and have a load rating of C, so that may be the reason for that. The door sticker is for (P)assenger rated tires, which is what came with the truck.

Maybe I'm running mine to high? Don't know. Only got a couple thousand on them, but they don't seem to be wearing in the middle as you would think an overinflated tire would.

 

Okay, I'm not sure if this suggestion is going to make any difference in your mpg, but here goes.

I notice that you have an ORP. That means you have skid plates. Take them off. They're extra weight that you may not really need. Since you bought it used, it also could be caked up with mud that you can't see. Again, extra weight means lower mpg.

 

Tire pressure is a little low. The factory gives those numbers based on tire type and for best handling. I always run 35 psi...

The front and rear differentials came with synthetics. I changed the front to Mobile1 and the rear to Amsoil and WOW I could not beleive I could notice a smoother ride. Also have Mobile1 in the transfer case.

Weight should be a factor, but I got 18 MPG on may last trip with a truck FULL of luggage and a heavy steel cargo carrier on the rear with crap loaded on that!


I hear WAX can maker her slip through the air REAL cleeeeean!