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Jim
Dodge Dakota
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12/10/2005
03:01:45
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 Subject: Better fuel mileage?
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Message:
In the winter I notice my gas mileage drops a couple mpgs, apparently because of the colder outside temps. Is this due to the IAT sensor reading colder incoming air? If so, could one place the air cleaner intake to pick up warm air from behind the radiator, fooling the sensor to think the outside temp is actually a summer temp and get better mileage for winter driving? Just wondering.
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AmsoilSponsor
DakotaEnthusiast
12/10/2005
09:41:32
|  Better fuel mileage? Amsoil Synthetic Lubricants
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THE PRIMARY REASON -- It has to do with the fact that there are different gasoline additives used during the Summer months vs. the Winter months.
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prodak
Dodge Dakota
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12/10/2005
16:27:11
| RE: Better fuel mileage?
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Message:
Jim, you definitely have the right idea. I replaced that rubber flap next to the radiator that everyone says to cut out and picked up 1-2mpg summer AND winter (snorkel on stock airbox removed) and BTW didn't notice any performance loss (can still chirp the tires with 3.55 LSD).
From this thread: http://www.dodgedakota.net/boards/v6/7538.html
posted by Larry/J&J Auto:
"You want gas mileage stick your intake tube on the radiator and let it suck hot air and watch what happens to your mileage it will jump"
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Yep
Dodge Dakota
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12/10/2005
23:57:23
| RE: Better fuel mileage?
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Message:
Warmer intake air requires less fuel.
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cuzindoug
GenIII
12/11/2005
00:53:08
| RE: Better fuel mileage?
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You also realize that you will be running in open-loop longer because it is cooler outside? You burn more fuel when in open loop (<160 degree coolant) verses closed loop (>160 degree coolant)
If it ain't broke, fix it til it is.
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MadMason
Dodge Dakota
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12/11/2005
08:33:03
| RE: Better fuel mileage?
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So warmer air gives you more mpg?
Why is K&N claiming on their website that their Cold Air Intake gives you more power AND milage?
That seems kinda strange to me.
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Fed
GenII
12/11/2005
16:14:55
| RE: Better fuel mileage?
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more power, same mileage
'93 Dakota CC 3.9 auto
(4.10, limited slip, exhaust, intake, lowered)
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daddio
Dodge Dakota
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12/11/2005
20:40:21
| RE: Better fuel mileage?
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warmer air will increase mileage but decrease power.
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cuzindoug
GenIII
12/11/2005
21:57:54
| RE: Better fuel mileage?
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Like everyone has said, cooler air is more dense, but requires more fuel therefore you get more power, so you WILL get better fuel economy if you keep you foot out of it. Warmer air is less dense, requires less fuel therefore you will get slightly less power, but better fuel economy all around. Like the amsoil sponsor said, they have different fuel blends for winter and summer due to the change in temp, and the engine "polluting" more when it is cold. These additives work with the temperature, but not with fuel economy, there is no getting around it. And like I said recently, your engine will be running in open loop(runs of PCM presets to warm the engine fast...more fuel consumption) longer, because it will take longer for your engine to reach 160+, especially if you are like me, and have a 180 tstat.
If it ain't broke, fix it til it is.
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prodak
Dodge Dakota
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12/12/2005
01:48:17
| RE: Better fuel mileage?
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MadMason-
CAIs are usually less restrictive than the stock setup, so better air flow = more power AND mpg.
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MadMason
Dodge Dakota
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12/12/2005
11:19:14
| RE: Better fuel mileage?
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Message:
thanks for the info on the CAIs.
so what do i have to do to get the max mpg out of the truck? just cut of the snorkel of the air cleaner box? or do i have to install a new snorkel direceted to the fan? what about the rubber flap that was mentioned befor? cut it out?
how much power will i lose and does it have a negative effect on engine life?
thanks in advance
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prodak
Dodge Dakota
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12/12/2005
12:22:10
| RE: Better fuel mileage?
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MadMason, all I did was remove the snorkel and enlarge the hole to about 5" diameter. Leave the "flap" in place, just let it suck engine compartment air.
As to performance, truck has plenty of guts for my taste (easily spins 30" tires w/3.55 LSD/auto tranny on dry pavement).
If I keep it under 65 on the highway I get 24mpg winter and 25 summer.
Other things which may/may not affect my mpg: V8 throttle body, synthetics in motor and differential, 180 degree thermostat, Bosch platinum plugs (the regular ones).
Bottom line: the stock airbox is extremely restrictive, opening it up a little made more difference than everything else I did combined - and it cost nothing.
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Jim
Dodge Dakota
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12/12/2005
12:32:27
| RE: Better fuel mileage?
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Message:
Thanks for all the replies. The best mpg I've gotten so far has been 23.1 @ 70 (summer) on mostly Interstate travel. Pickup is a 35K '00 3.9l CC AT/OD 3.92 posi rear with 275/60R-15 tires and a fiberglass bed cover. So I guess with a little fine tuning such as, tire pressure, synthetics, driving tactics (no jack rabbit starts), good plugs wires and cap, the hot air intake, I could get 25 or better. Ya think?
Could also draft semis on the Interstate but I'd hate to think the consequenes of catching a thrown skin. Ouch!
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prodak
Dodge Dakota
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12/12/2005
12:43:06
| RE: Better fuel mileage?
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Jim, you are doing really well to get that with the shorter gears and 28" tires @70mph (and a stock intake setup?). Let us know if you manage to improve on that.
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Jim
Dodge Dakota
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12/12/2005
13:22:02
| RE: Better fuel mileage?
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Message:
Prodak, yeah its a stock intake setup (former Granny pickup). I thought of taking the plastic elbow off and plumb in some defrost tubing and direct it behind the radiator, temporarily, to see if any change occurs.
I'd also like to replace the fiberglass cover with one of those rollup covers which would save me a bunch of weight. After having to remove it once after a fender bender, I didn't realize how heavy those things are.
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