Fuel milage diff between 6.4 & 6.7

[fasthawk]

Thinking of selling my f150 and steping up to a diesel.
I would like to know real world milage between the different years modded and unmodded. I already have a 6.4 but it is a service body truck with 4.88 gears. Also what have some of the promblems you have had. My 08 has had some oil leak issues and thats about it

[Eric@PTP]

Mileage will be better with the 6.7, power will be better with the 6.4 if you plan on tuning them.

[fasthawk]

Originally Posted by Eric@PTP

Mileage will be better with the 6.7, power will be better with the 6.4 if you plan on tuning them.

I do not plan on tunning them , they have plenty of power left alone. My work truck weighs in at 12.5k and when i pull a trailer it goes upwards of 24k combined. I have no promblems at that weight either , but dot is starting to crack down and i have already received a $500 ticket for towing the trailer because the sticker says 12k on the trailer and 16k on the door of the truck so that puts me at 28 so you need a cdl class a combination. If i sell my 150 and buy a 250 to tow with i am legal. Also can a 250 pull 10,5 on the trailer hitch. My 450 has a 16k hitch on it.

Still wanting to Know on your everyday use fuel milage between 6.4 and 6.7 to see if it is worth the money difference in price when buying.

[6.0f250firstcar]

Stock to stock the 6.7 will be better mileage wise.

[Eric@PTP]

If your not going to tune it then get a 6.7

[fasthawk]

Originally Posted by 6.0f250firstcar

Stock to stock the 6.7 will be better mileage wise.

By how much because you have to use the fuel additive for epa don't you and how much is that and how long does it last. The only thing i my get after the truck is out of warranty would be a dpf delete kit on both. I will not turn the power , more power more broken parts.

[Eric@PTP]

Originally Posted by fasthawk

By how much because you have to use the fuel additive for epa don't you and how much is that and how long does it last.

DEF is not a fuel additive, DO NOT PUT DEF IN YOUR FUEL TANK. If you do that kiss your injection system good by all $10,000.00 plus dollars worth of repair of it out of pocket because Ford will not warranty that screw up.

There is a completely separate tank for DEF, its is behind the same door but the smaller cap is for the DEF the larger cap is for diesel. You can mix it up one way or the other unless you like super expensive repairs.

[6.0f250firstcar]

What you are referring to is DEF. It runs around $40 a gallon and needs filling at about every oil change.

[fasthawk]

Originally Posted by Eric@PTP

DEF is not a fuel additive, DO NOT PUT DEF IN YOUR FUEL TANK. If you do that kiss your injections system good buy all $10,000.00 plus dollars worth of repair of it out of pocket because Ford will not warranty that screw up.

There is a completely separate tank for DEF, its is behind the same door but the smaller cap is for the DEF the larger cap is for diesel. You can mix it up one way or the other unless you like super expensive repairs.

I heard they have two different tanks but did not know what they call the stuff for the emissions.

[fasthawk]

So what is the average person getting for fuel milage wise between the 2 dfferent motors because my work truck only see's 9.2 at best on the dash.