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Author Topic: Warming up the car Back to Topics
JamCoope

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Maryland

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Message Posted: Jan 26, 2011 10:21:52 AM

Most people agree that cars run more economically once they're warmed up... especially in the cold winter months.

Here's a question: has anyone tested whether it is more economical to let your car warm up by idling in the driveway, or by just letting warm up as you drive?
REPLIES (newest first) Post a Reply
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Les4hdtv
Sophomore Author Alabama

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Message Posted: Aug 31, 2014 12:42:31 PM

Yes, this test was easy - based on the Trip MPG indicator which measures MPG starting when the car engine is started: It uses more fuel if you let it idle.
Test Setup: Back out of the garage and proceed 1/2 mile to the top of a big hill and check it at the same place with and without one minute idle.
Car Tested: 2013 Toyota Camry XLE.

General Note: The colder the garage temp, the lower the MPG.
This is most likely because the engine choke is on longer, till the engine can run on its own.
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b899
Champion Author Connecticut

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Message Posted: Aug 30, 2014 9:28:54 AM

no
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b899
Champion Author Connecticut

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Message Posted: Aug 28, 2014 8:28:58 AM

no
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contiki
Champion Author Ontario

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Message Posted: Aug 27, 2014 7:23:06 AM

It summertime ....not needed.....only do it in the winter months.....
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redfish67
Champion Author Dallas

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Message Posted: Aug 26, 2014 11:44:38 AM

no
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Awing1
All-Star Author Ontario

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Message Posted: Aug 26, 2014 11:11:46 AM

yes
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b899
Champion Author Connecticut

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Message Posted: Aug 26, 2014 8:27:15 AM

no
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b899
Champion Author Connecticut

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Message Posted: Aug 24, 2014 10:08:11 AM

no
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contiki
Champion Author Ontario

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Message Posted: Aug 24, 2014 8:03:53 AM

Not in the summer months....................
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redfish67
Champion Author Dallas

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Message Posted: Aug 23, 2014 9:13:02 AM

no
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contiki
Champion Author Ontario

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Message Posted: Aug 23, 2014 8:26:27 AM

Weather is warm....not needed.....warm up engine only in the winter months..
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hyeglenn
Champion Author Fresno

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Message Posted: Aug 20, 2014 8:55:19 PM

Not with the new cars.
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packerfan14
All-Star Author Twin Cities

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Message Posted: Aug 20, 2014 6:10:41 PM

start drive
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Jetta_Pilot
Champion Author Toronto

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Message Posted: Aug 20, 2014 1:31:32 PM

The recommended procedure is to start the car. In real cold winter weather start and let it idle for 30 seconds and then drive off but NOT at interstate speeds !
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dontuknowOH
Champion Author Ohio

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Message Posted: Aug 19, 2014 10:54:48 AM

If one can afford a dependable vehicle with an A/C....Heater system (Comfort Controlled System) "Cabin Luxury" Don't worry about a Drop drip drop of fuel use to fend off terrible weather.

The roof, locks, hand/foot controls are at your mercy by your $$$$. If I can't afford a high end vehicle but must drive, I want reasonable safety, and affordable comfort ahead of walking ETC. Basic Vehicle, no frills!

I'm not ready to drive a piece of junk, did that way back, no fun using an umbrella inside the vehicle. If I wanted to. If my car gets warmed, I'm going to be sure I get it too.....
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b899
Champion Author Connecticut

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Message Posted: Aug 19, 2014 8:32:44 AM

no
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twt
Champion Author Virginia Beach

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Message Posted: Aug 19, 2014 5:34:49 AM

Any time your engine is running, you're using gas. DUH
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blupupher
Champion Author Houston

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Message Posted: Aug 18, 2014 11:03:10 PM

I start and drive.
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gas2guzz
Rookie Author New Jersey

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Message Posted: Aug 18, 2014 4:56:35 PM

I ~never warm up the car, with the exception of frost on windshield. Just drive off slowly and conservatively.



[Edited by: gas2guzz at 8/18/2014 5:00:52 PM EST]
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Hemond
Champion Author Providence

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Message Posted: Aug 18, 2014 12:48:28 PM

My 2.4l car uses about 4 horsepower at idle. That's the same as a lawnmower. My mower runs all summer on a tank of gas.

Idling uses an insignificant amount of fuel. Warm it up if you want and don't let people tell you it uses fuel.
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pvdray
Sophomore Author South Bend

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Message Posted: Aug 18, 2014 11:31:10 AM

Unless the cold temps are extreme, I do not warm up the car and I have not seen a difference in fuel economy
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contiki
Champion Author Ontario

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Message Posted: Aug 18, 2014 7:49:27 AM

Summertime ....not required.......only in the winter months..........
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b899
Champion Author Connecticut

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Message Posted: Aug 17, 2014 8:55:52 AM

no
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b899
Champion Author Connecticut

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Message Posted: Aug 14, 2014 8:30:21 AM

no
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OilerFan
Champion Author Tulsa

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Message Posted: Aug 12, 2014 7:17:10 AM

when the winter is here, I know the engine oil needs to warm up enough to flow well within the crankcase. Other than that, I don't worry about warmups.
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twt
Champion Author Virginia Beach

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Message Posted: Aug 12, 2014 4:43:44 AM

If your engine is running, you're burning fuel.
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luvmyrv
All-Star Author Winnipeg

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Message Posted: Aug 11, 2014 9:50:15 PM

pretty hard to test that with any degree of accuracy.
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luvmyburgi
Champion Author Ohio

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Message Posted: Aug 11, 2014 8:37:40 PM

No
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b899
Champion Author Connecticut

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Message Posted: Aug 11, 2014 8:57:47 AM

no
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contiki
Champion Author Ontario

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Message Posted: Aug 10, 2014 8:30:00 AM

Not needed now, only in the winter months......
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Mikeyl
Champion Author Cleveland

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Message Posted: Aug 9, 2014 10:44:00 AM

Nope, not even in the middle of winter.
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b899
Champion Author Connecticut

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Message Posted: Aug 9, 2014 9:31:18 AM

no
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redfish67
Champion Author Dallas

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Message Posted: Aug 6, 2014 10:12:55 AM

no
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jay93LA
Champion Author New Orleans

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Message Posted: Aug 6, 2014 9:29:37 AM

no
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b899
Champion Author Connecticut

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Message Posted: Aug 6, 2014 8:20:54 AM

no
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b899
Champion Author Connecticut

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Message Posted: Aug 4, 2014 7:53:58 AM

no
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dontuknowOH
Champion Author Ohio

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Message Posted: Aug 2, 2014 8:54:23 AM

StArrow68 I agree on the rev-ups for a High Performance Engines designed for great HP/CU inch. Even without loading or winding out the rpm band.

High piston speed along with other engine parts if so designed/built for performance near one HP per CU inch displacement or more as super-charged, oil temps are very important.

Never racing a cold engine improves it's life span even Diesels much more. Their compression is so much higher and most are longer stroke.

The newer alloy engines warm quicker and the oil tolerances can be much different in certain areas. Higher than 180F* oil temps can cause oil evaporation/residue with the older oils of past years, I'm not sure about todays newer tech. types.

Oil that is smoking heavily is too hot, but that occurs near the lower cylinder walls, still on the average I don't like to see it get near 180 F* sump'ed. G-Luck!

I was told by a Tranny Tech that modern T-Fluid is tested for over 300F* or more before break-down, that was years ago, so Engine oil today probably can suffice lubing the short stroke engines, notice the newer rated weights required by OEM designers. for over 100K miles at least engines holding together with average care or worse..... My take.....
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contiki
Champion Author Ontario

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Message Posted: Aug 2, 2014 7:03:22 AM

We only warm up our vehicles in the cold winter weather.........
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twt
Champion Author Virginia Beach

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Message Posted: Aug 2, 2014 4:43:41 AM

If your engine is running, it's using gas. How hard is that, to figure out?
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StArrow68
Champion Author Oakland

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Message Posted: Aug 1, 2014 11:41:11 AM

dontyouk...., might want to rethink the 90 secs and some day drive a car with an oil temp reading. When my coolant is up to 194, normal operational temp, the oil is still below 100 degrees and that could be five miles from home. From track experience I don't rev the engine until oil is above 165, so I'm usually under 3k rpm for 7 to 9 minutes, then again I can drive the Vette just fine under 2k rpm. Over 3k is just for the song!
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jorobins538
Champion Author Chicago

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Message Posted: Aug 1, 2014 10:03:41 AM

seems like a waste to let it run in the driveway - unless you are trying to melt some of the two inches of ice that froze on the windshield the night before.
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carinthuist
Champion Author San Francisco

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Message Posted: Jul 31, 2014 7:00:55 PM

yes
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b899
Champion Author Connecticut

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Message Posted: Jul 31, 2014 8:34:40 AM

no
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b899
Champion Author Connecticut

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Message Posted: Jul 30, 2014 8:37:34 AM

no
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contiki
Champion Author Ontario

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Message Posted: Jul 27, 2014 7:34:06 AM

Only in the winter months......
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Jackson126
Veteran Author Virginia

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Message Posted: Jul 26, 2014 6:42:06 AM

A little
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b899
Champion Author Connecticut

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Message Posted: Jul 25, 2014 8:01:48 AM

no
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dontuknowOH
Champion Author Ohio

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Message Posted: Jul 24, 2014 9:23:47 AM

Older bones, often need TLC. Cabin heat could be a factor for some, ones vehicle can be an accommodator, with an additional fuel cost each time, and They sell those options as a Cool Wise Choice.

My cabin Heater/AC works well if I can make the decision to use it before fearing of running out of fuel. That hasn't happened yet, TLC. thoughts Right !(if needed).....Vehicles don't have Bones..... Bolts maybe.....
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b899
Champion Author Connecticut

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Message Posted: Jul 24, 2014 8:19:54 AM

no
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ggg452
Champion Author Manitoba

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Message Posted: Jul 20, 2014 9:39:00 AM

I agree dontuknowOH....my usual routine as well...
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