Krob

I drove 350 miles today fueled before I left fueled at destination. All freeway, and cruise control at 72mph and I left the XZT+ on the fuel saving setting the entire way. However I only got 16.6 mpg.

Last time I did something like this I got more like 18-19mpg. Had edge ez then though and summer fuel.

I know its winter fuel however I did not think id see that much of a Drop is that the culprit?

Also what is the best air pressure to run when empty for milage?

Thanks
Rob

DodgeCowboy

Robins when was the last time you cleaned the IAT sensor? supoda if there dirty it can cut power and fuel mpg I am going too do mine in the morning and I will report back too what I find if my mpg goes up or I am in the same boat as you. I know I might need a new fuel filter next weekend it will get one.

Krob

I was just saw that and kicked myself for frogetting about it.

What do you use to clean it Break cleaner?

How hard is it to get out what tools do you need?

Krob

i found a good right up on geno's http://dodgeram.org/tech/dsl/sensors/IAT/clean.htm
Think ill give it a little cleaning and next time i service the truck ill put a new one in.

Valv

A new IAt sensor for your truck is only $ 23k, forget cleaning, get a new one, I gained 3mpg just from that, it paid itself off at 1st tank fill, you will be impressed.

Cleaning helps a little but not as much as a new one.

Also which size tires do you have ? Is the speed and odometer correct ?

98.5Hotrod

Don't want to sound like a smart a** but when was the last time you changed or cleaned the air filter.

Dartmouth 12V

One tank of fuel is usually not a good indicator but if you see a trend, then you have to worry. Often times people don't fill to exactly the same level which throws off calculations and there are several environmental factors. Pretty much any wind will cause a large decrease in mileage as well as rain or winter fuel.

Krob

Air filters good. I maintnace the living #$%^ out of this truck because i pratcially live in it.

I payed pretty close attention to the wind and it only blue for a little bit of the drive but i could be wrong.

I filled it both times to the return spigogt.

Any way i am going to call around today and see if i can find a IAT sensor in town.

DodgeCowboy

Hey man I just got mine out and it was black as my black lab so I cleaned it off and reinstalled it and I will run it for awhile see if I need a new one.

Krob

Alright guys dont laugh to loud. I am a dumb a$$ i put my keys in the ignition to role down the window and then frogot to turn it off then went and unplugged the map and iat. Now i have service engine light on and some codes. How do i make the service engine light go off?

DodgeCowboy

I believe un hook the battery's and it will clear if not go to shucks or autozone and have them read the codes for free and clear em.

Valv

We are laughing hard......just kidding!!

I would just wait few key cycles, I did same thing (laugh at me now...) and left MAP unplugged, got CEL on but it went away after few starts. I actually have a scanner and checked codes there was nothing set.

Krob

On my way to the dyno days that were going on in Vancuouver WA the service engine light went out so eh what ever. I am going to service the living snot out of the truck this next weekend.

Oil
Tran fluids
Diffs
IAT

anything else im missing i should add.

oh yeah i did 300hp and 728ftlb however i think that was only with timing on XZT+

I got 278hp and 591 ft lbs with the xzt+ off