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Old 07-18-2019, 07:29 PM
 
Location: West Phoenix
966 posts, read 1,347,070 times
Reputation: 2547

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if you see mileage increase on your odometer, just drive the same distance in reverse.
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Old 07-18-2019, 07:34 PM
 
Location: annandale, va & slidell, la
9,267 posts, read 5,122,800 times
Reputation: 8471
Quote:
Originally Posted by Hairy Guy View Post
If I turn on my car and let it idle for hours on end, does that count as "miles driven?" Example, I buy the car new with 0 miles. I idle the car for hours daily for a month. Over that time, will it actually show miles were driven because the engine/RPM was running? I am trying to sell a car and don't want to add mileage any further but do turn it on once a week so the battery does not die.
Just drive it in reverse as much as possible and you will reduce the miles on the odometer.
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Old 07-18-2019, 08:00 PM
 
18,069 posts, read 18,826,533 times
Reputation: 25191
If you are going to be idling for long periods of time often, you should get an hour meter and set your maintenance schedule to that.
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Old 07-18-2019, 09:42 PM
 
Location: Montgomery County, PA
16,569 posts, read 15,281,778 times
Reputation: 14591
Quote:
Originally Posted by kwong7 View Post
Generally no. I can't think of a single vehicle where the mileage ticks up with the engine on without the transmission rotating. However, large trucks (including our Duramax) also tracks hour rating of engine usage. We've got over 4,000 hours on ours.
This got me thinking. What's the hour rating of a car with 100,000 miles on it? At a 40 mph average, it takes only 2500 hours. There is idling of course but still, it's a lot less than I thought. How did you rack up 4000 hours?
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Old 07-19-2019, 12:36 AM
 
Location: Cebu, Philippines
5,869 posts, read 4,213,146 times
Reputation: 10942
Quote:
Originally Posted by Axxlrod View Post
Your odometer is tied into your transmission. It measures distance driven when the car is in gear.

Forward only. It ignores movement in reverse.
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Old 07-19-2019, 05:10 AM
 
Location: Riverside Ca
22,146 posts, read 33,552,235 times
Reputation: 35437
Quote:
Originally Posted by Hairy Guy View Post
If I turn on my car and let it idle for hours on end, does that count as "miles driven?" Example, I buy the car new with 0 miles. I idle the car for hours daily for a month. Over that time, will it actually show miles were driven because the engine/RPM was running? I am trying to sell a car and don't want to add mileage any further but do turn it on once a week so the battery does not die.
Nope mileage only increases when car is rolling but a lot of new cars today have hour meters built in the dash displays
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Old 07-19-2019, 07:22 AM
 
17,326 posts, read 22,065,118 times
Reputation: 29713
Quote:
Originally Posted by Hairy Guy View Post
If I turn on my car and let it idle for hours on end, does that count as "miles driven?" Example, I buy the car new with 0 miles. I idle the car for hours daily for a month. Over that time, will it actually show miles were driven because the engine/RPM was running? I am trying to sell a car and don't want to add mileage any further but do turn it on once a week so the battery does not die.
Why not test the theory?

Go out and look at the mileage, take a picture or write it down.

Then run the car for 10 minutes, then compare the current mileage to what it was before you started the car!

Just to be sure, do the test again but this time run the car for 12 minutes instead.


Let us know what you find!
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Old 07-19-2019, 07:24 AM
 
17,326 posts, read 22,065,118 times
Reputation: 29713
Quote:
Originally Posted by cebuan View Post
Forward only. It ignores movement in reverse.
Any one watching 80's movies knew this from Ferris Bueller!


https://www.youtube.com/watch?v=louFRE4vwHY
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Old 07-19-2019, 07:42 AM
 
Location: Grosse Ile Michigan
30,708 posts, read 79,831,000 times
Reputation: 39453
Quote:
Originally Posted by rbohm View Post
miles driven is based off TIRE revolutions, not engine revolutions. when you idle the engine you are getting zero mpg because you are not going anywhere.
No. It measures off the transmission. If you disconnect the drive shaft and run the car in gear wit hut moving, you will log miles.
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Old 07-19-2019, 07:43 AM
 
79,907 posts, read 44,222,338 times
Reputation: 17209
Just leave your A/C off. Your odometer is run off your A/C.
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