seamonster

So does premium fuel give you better mileage with the new 5.3? There was a post on here that I cant find that said somthing about the new trucks computer being able to run different mapping if premium fuel is used?

There was a post on here a while back that explained why premium does help the mileage on these new trucks, I cant find it maybe someone can??? If you can get gas without ethanol your mileage will definately increase!

I think if they did away with the indicator most of the problems would be gone. Just drive the truck and let the computer decide what gear to be in and how many cyclinders are active. I know this is not easy I am anal about my vehicles and worry about everything. If it doesnt make a difference in MPG I wonder why they would put it in there. It has to cost them money to build it in there and definately makes some people unhappy so if it doesnt increase MPG why are they doing it? Government MPG regulations maybe?

Perhaps you were in a lower gear(because of the tow haul) which would make more rpm's and maybe enough torque to make the v-4 work better. Try locking out 6th gear and seeing if the v-4 mode works better. What gears do you have? 3.08?

How do you guys calculate it yourself that is more accurate than the computer? Do you fill it till you can see gas or how do you know exactly how much it used? I would think the computer would be more accurate.

Here is a real question--- which gears do you have? I am wondering if the AFM works better with the 3;42 than 3:08 It works great on my 07 6.0 with 4:10's so I am wondering how much gearing has to do with how well it works.

Whats up with the name calling? Cant you see we agree----the AFM feels like a gear shift! Many people want 6 and 8 speed tranny and then complain they can feel AFM. That is what I dont understand. So stick your name calling up your a@@ hate to see what you would say if i disagreed with you. No reason we cant keep this friendly. FYI its not the transmission that switches from V4 to V8 ---I think that may have been a typo on your part so should I call you names now? I dont think that is how this forum goes.. One last thing----this is kind of funny----My name is Dick. So you can call me that all day just dont call me late for supper.

I dont understand this at all! Who cares if you can feel it do its job Most guys on here cried and cried we need a six speed and now they suck because they dont have an 8 speed like dodge. Who cares if you can feel it go into V4 mode it sure isnt any different than all that shifting with the 6 and 8 speeds. FYI I have AFM and I do feel it working and I like it! It has been great on my 07

You never mentioned your mileage on the truck. Oil consumption usually starts at 30,000+ miles. Do the 6.0's have AFM? My 6.0 in my 07 1500 vortec Max has AFM and does not use oil but I only have 11K on it.