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Old 4th May 2006, 18:30   #1
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Question Checking Mileage?

Hey buddies...i checked the mileage for my swift...i got 17.84 on the highway with A/C on.Let me ask you guys one thing...i have changed the stock tires to 195/60/14.Do i have to calibrate my tachometer or something if i have to check my mileage since i have changed the tires.Does that mean that the mileage that i have given now...17.84 ie..is wrong???
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Old 4th May 2006, 18:38   #2
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Quote:
Originally Posted by swaroop_babu
Do i have to calibrate my tachometer
why do need to calibrate tacho????

there could be speedo error... check this site...
http://www.miata.net/garage/tirecalc.html
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Old 4th May 2006, 20:49   #3
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I guess you meant the "odometer" and not the "tachometer".
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Old 4th May 2006, 21:19   #4
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yes...changing to a bigger tyre size definetly calls for recalibration. Your milage may be slightly off ...by a 2/3 kms.
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Old 4th May 2006, 21:25   #5
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i guess there is noo need to calibrate with the taccometer.....!!!!!
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Old 4th May 2006, 21:34   #6
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adding to the question ... whats the best possible way to check milage for your car ..
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Old 4th May 2006, 21:46   #7
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Quote:
Originally Posted by the real Big B
adding to the question ... whats the best possible way to check milage for your car ..

This question has been answered many times.
Anyways, here goes:

1. Fill the tank completely.
2. Run for a few kms (say x)
3. Fill the tank completely again.
4. divide x by the number of litres filled in step 3.
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Old 5th May 2006, 17:57   #8
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Quote:
Originally Posted by swaroop_babu
Hey buddies...i checked the mileage for my swift...i got 17.84 on the highway with A/C on.Let me ask you guys one thing...i have changed the stock tires to 195/60/14.Do i have to calibrate my tachometer or something if i have to check my mileage since i have changed the tires.Does that mean that the mileage that i have given now...17.84 ie..is wrong???
195/60 R 14 is the wrong upsize...(It should have been 185/70 R 14 or 195/65 R 14) means the rolling radius is 1852 mm compared to 1946 mm in the original 165/80 R14 the swift comes with...your speedo will show the speed faster by about 4.84 %...means if you are travelling at 66.6 kmph, it will show you 70 kmph...also the mileageg you got as 17.83 is, in reality, closer to 17 kmpl..
check this link out if you want to know more about upsizes
http://www.carbibles.com/tyre_bible.html

Last edited by Buffetfan : 5th May 2006 at 17:58.
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Old 5th May 2006, 18:07   #9
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There you are. BuffetFan did the calculation for you. Remember, you should never change the overall rolling radius. Need for calibration aside it may also cause other problems for you, like changed dynamics, damaged wheel-well, damaged suspensions etc.

In your case, if the mistake can not be rectified and you would rather live with it you may need to recalibrate the speedo (not tacho). Of course you can always do that mental calculation without actually changing the settings but then it will log more kms than it actually travelled. Over a period of time the odo will actually show many more kms than actual. This will bring down the resale value of your car.
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Old 5th May 2006, 18:51   #10
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Quote:
Originally Posted by Buffetfan
195/60 R 14 is the wrong upsize...(It should have been 185/70 R 14 or 195/65 R 14) means the rolling radius is 1852 mm compared to 1946 mm in the original 165/80 R14 the swift comes with...your speedo will show the speed faster by about 4.84 %...means if you are travelling at 66.6 kmph, it will show you 70 kmph...also the mileageg you got as 17.83 is, in reality, closer to 17 kmpl..
check this link out if you want to know more about upsizes
http://www.carbibles.com/tyre_bible.html

Thanx buffetfan.anyway it doesnt affect that much rite?just 1 kmpl.no probs as far as i am concerned.cos for this car....17 with ac on is cooooooool!!!!!!
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Old 5th May 2006, 19:02   #11
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You missed the whole point swaroop babu. The avg is an altogether different matter but such deviations
* defintely loose the warranty of the car.
* reduce the life of the parts.
* reduce the resale value of your car. (Read my previous post)

So you loose in all the fronts... as long as the car is with you and also when you sell it.
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