I have a 01 King Ranch 86000 miles on it. purchased used, i think all is stock.

I have run 3 tanks thru it and the best is 12 mpg. I was hoping for at least 15 or 16.

Any ideas as to what might be going on or any advice on what to look at?

Thanks in advance.

 

Clean the MAF, change the air and fuel filter. You probably have those big fancy RK wheels on it. They are heavy and cost you gas mileage.

 

For an old 2V 5.4L, 12 MPG isn't too far from normal if your talking about city or mixed driving.

There are a few things you can do to squeeze another 1-4 MPG from your truck. Keep the RPM's below 2000 while accelerating, coast to stops and into turns, inflate your tires to the max on the side wall, lose the off road tires and big rims, remove unnecessary weight from the cab and bed (tool box), stay under 65 MPH on the highway. With as many miles as you have, I would just replace the MAF (buy OEM). Hook the truck up to a code reader. You may have a code for an 02 sensor or MAF in memory even though the check engine light is not on.

 

That's no fun!

 

True, but that fun is getting to cost more than it is worth. I've reset the mpg computer and backed off to 65, and it's amazing how the MPGs go up.

 

I'm lucky that I drive 90% highway miles. Cruise control is your friend.

 

Like the guys above mentioned, good maintenance practices and driving habits will help the most. Make sure to keep all fluids, filters, and sensors in good working order, slow down, and use the cruise whenever possible. One other item I didn't see mentioned was the coolant. Make sure yours is clean and has the correct mix to keep your engine running at its optimal temperature. Each one does very little by itself, but add them all up and you should see a sizable difference.

As Stealth said it's no fun taking all of the pretty stuff off, however as greencrew pointed out pretty is getting very expensive.

 

I've got a new one, and she only gets 14 avg mpg... And I haven't added anything but a carseat! grrrr!!

 

I got my '01 HD from 11mpg to 13 by pretty much doing the above. I have a K/N 77series and I still have the 20" rim/tire combo.

Im looking into getting a tune but if you wisper "tune" and a shouting match over which tuner is best occurs.

 

on my 02 5.4L 4x4 my milage dropped as followes in order as mods were added. stock-16mpg superchipped-14mpg flowmasters-13mpg 285-70r17-12mpg whats up with that? im scared to do anything else in fear ill hit the single digits.

 

ok stupid questions time.

1 - WHY can I not send a private messege?

2 - I take it MAF is Main Air Filter?

THanks

 

1) You have to be a member for 90 days first and I think have 100 posts.

2) Mass Airflow Sensor

 

Thank you. I got a lot to learn.

 

That's what we're all here for

 

Like the others say, keep your foot out of it. I can get 10% better MPG's with slow starts.