Well gang... I've been playing with theories and ideas for long enough now its time to put them into a design and see if it actually works. We all know the 24V's seem to take a good tumble in MPG's as the winter sets in well ISX proved that with the 12V engines with static timing that MPG's don't change. Well if you look at it the only thing that could be tossing this out the window is the IAT sensor on the 24V is changing the VP44 performance. Most know that colder air produces better HP/TQ because colder air is denser and requires more fuel to keep balanced. Well if you reverse this and warm the air (in theory) the VP44 should retune and burn according to the manifold temp. So what I've done tonight is fished through my resistor pile and found 3 I'm going to use for test candidates. Orange - White - Red - Gold = 3.9K Ohm = 116*F IATRed - Violet - Red - Gold = 2.7K ohm = 132*F IATRed - Black - Red - Gold = 2.0K ohm = 148*F IAT So now tomorrow I'm going to pull 3 test runs on the same piece of highway... Seeing if the highier the IAT temp increases the MPG or not... I'll can give you something to think about... Grid heaters are NOT controlled directly by the IAT... With the 2.7K Ohm resistor in place before even starting the grid heater still where hitting as normal. So there is more to the grid heater that the IAT temps... ... On the cutting edge again...

In addition to the Winter fronts and resistors you might try a thermal blanket kit on the engine and to insulate the hood. This would hold is a LOT more heat that would normally be lost that the engine has to work make up for and compensate. They are not cheap but neither is diesel fuel. If it helps save on fuel, it may be worth it. http://www.atpwrap.com/html/dodgeram.html

Mouse habitat!! Heated no less.

combined stop and go, 2 lane highway and interstate 346 miles 17.72 gallons 19.52 mpg. wife drove some with a heavier foot and I did blow some smoke getting on the interstate - my grandkids were impressed with the smoke. I wish I had seen it.

I have a 4-switch box from Prowelder and like it a lot. I just got winter fronts and have the block heater on for about 3 hours before I drive it in the mornings. I'm outside Chicago, so it can get relatively cold. I turn on high idle or 3cyl high idle if the engine is cold until coolant is around 80F. IAT is fooled to 143F whenever I'm not warming up. Smarty on 1, TST on 0.My last tank was 495 miles, 24.006 gal, DSL was 3.72/gal, I added 14 oz of 2-stroke (3.50/quart). That is 20.62 mpg and 18.6 cents per mile. I don't drive more than 55 (the limit) and have a 36 mile commute each way; about 20 mi interstate, 6 local highway, and 10 in town-ish. During the summer I tune my truck for performance, not mileage, and get about 117 avg. Over the 13,000 miles I've owned my truck my overall mileage is 19 mpg at an average cost of 21 cents/mile.I can't say for certain what impact the IAT fooler has made considering the other things I've done for mileage. I'll report back later this winter when things are colder and I have a good winter baseline. That way I can remove only the IAT fooler and leave everything else static.

Mouse habitat!! Heated no less.

Squirrels would love that too

I have a 4-switch box from Prowelder and like it a lot. I just got winter fronts and have the block heater on for about 3 hours before I drive it in the mornings. I'm outside Chicago, so it can get relatively cold. I turn on high idle or 3cyl high idle if the engine is cold until coolant is around 80F. IAT is fooled to 143F whenever I'm not warming up. Smarty on 1, TST on 0. My last tank was 495 miles, 24.006 gal, DSL was 3.72/gal, I added 14 oz of 2-stroke (3.50/quart). That is 20.62 mpg and 18.6 cents per mile. I don't drive more than 55 (the limit) and have a 36 mile commute each way; about 20 mi interstate, 6 local highway, and 10 in town-ish. During the summer I tune my truck for performance, not mileage, and get about 117 avg. Over the 13,000 miles I've owned my truck my overall mileage is 19 mpg at an average cost of 21 cents/mile. I can't say for certain what impact the IAT fooler has made considering the other things I've done for mileage. I'll report back later this winter when things are colder and I have a good winter baseline. That way I can remove only the IAT fooler and leave everything else static.

Did you have to cut into the wire harness ?

Did you have to cut into the wire harness ?

Nope all plug and play.

We need to talk.

We need to talk.

PM sent my good man.