TOPIC: 2015 GMC truck 5.3 L

My 2015 GMC has 35 gallon tank. Started in Orlando Fl at 14.4 MPG drove home Savannah Ga back to Jacksonville Fl and home around town a little, it is learning now it gets 15.1 MPG.
Will find my plugs soon and gap up. See how MPG goes then.

Below was for my 1997 Chev truck it is wrecked now no road driving
As for my dissolving aspirin I used 1/2 oz or less H2O2 to dissolve 8 uncoated aspirin then added 3 oz EverClear 190 proof then filtered thro 4 layers white kitchen paper towels at each fillup from 25 to 28 gallons.

3-4-17 update
My 2015 GMC truck is now up to 17.2 mpg -- have done nothing to it yet-- when does computer stop " learning " increasing mpg ?

3-6-19 update
Now my 2015 GMC truck gets 19.4 mpg still learning.
Have been looking for PCV valves found 1 on driver side of engine but have not found other side yet, pictures from parts shop only shows driver side PCV valve.
Ask again today from another parts shop same thing for PCV valve, also ask about EGR and was told did not have EGR valve on my truck.

12-7-19 update
Took my 2015 GMC into dealer for a factory recall problem They found no problem. I ask agent if I modified the air inbound part [ where groove goes] would it void any warranty on truck ? He said yes for that part would not be covered any more, so my question is if my groove is in place will I need to change part before any warranty work is done if needed ? I do have a replacement part for groove.
Came back from Orlando Fl full of turkey and truck now gets 19.6 mpg
Thank You
geraldc

Only one PCV valve on this engine, Gerald, so you can let THAT go!

Would you be so kind as to edit the above comment and add the date of install as the follow-ups?

GREAT INFORMATION!!!! THANK YOU THANK YOU THANK YOU!!!

You're setting a good standard for others to follow.

Ron

Great, Gerald! This is encouraging to see. You're still using MPG Remedy, your mix sounds like what you've posted about in the past. Your example w/ MPG R seems to show that "Less is More" with it. When you deal w/ the PCV valve, I'd expect further gains. Right now your info indicates over 33% MPG gain.

Good for you, Gerald!!

Tracy G

Thanks Tracy I have not done anything to truck yet but change oil 2 times. Did take plug out but no way to adjust gap with no foot to on plug to adjust. So far only found 1 PCV valve and no EGR valve
geraldc

I'm dealing with a 99 Dakota, 3.9 6 cyl. It's being a little slow to come around.

Modified it weeks ago, been driving like I stole it, and it's creeping up from a measly 200 per 18 gal fill, now at 300.

So, I'm beginning to see some common reports on the gains being slow in the 98-02 in both Dodge and GM as being normal.

But my truck is now at 50%! And I am going to be at more than double before long!!!

Ron