If everything has been cleaned and replaced, then do the test over again. Actually log the miles so you know exactly how far you went and start with a full tank. When you refill the tank take the number of miles you drove and divide them by of gallons you put back in the truck.

 

the rams hav a 2 gallon reserve tank. so after you light comes on and your overhead reads 0 you still have a bout 2 gallons in the tank. i used to run my 3.7 about 40 miles after the light came on every time when i drove to colorado every week. i never got more than 23 in the tank. i had the trip laid out two stops and i was in rifle. make you a power wire i am seeing a 1.5/2 mpg difference driving easy

 

ok i guess ill wait and redo it just didnt think it would make that much difference.

 

k even if i only went 229 miles and used 18 gallons that's still 12.7 mpg........

 

my overhead says 11.7 religiously never have calculated it by hand thou im afraid to... i also dont do much freeway driving

 

yikes....as long as im not by myself i guess there isnt anything wrong....

 

What tune are you running with your cortex? How is the tire pressure?

 

i get 12.4 on the overhead but i drive like a bat outta hell lol

 

Tire pressure is right around 36 or something just enough to keep the tire pressure monitor off....im running the SC 91 tune. Could a egr valve be that bad??? it hasnt thrown a code or anything but would it if it was bad???

 

it might be going out... im going to change mine out here soon