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Old 07-01-2013, 07:49 PM   #1
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MPG better after lift and bigger tires?

Strangest thing. I added a 2.5" lift and 35" tires to my Jeep. I used the Superchips Flashcal to optimize the shift points for the tires, and set the tire pressure at 35. My miles per gallon seems to have gone up 3mpg from 17, to around 20.

or is my MPG gauge just wacky now?

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Old 07-01-2013, 07:50 PM   #2
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Summer gas. I see 2-3 jump in the summer.

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Old 07-01-2013, 07:52 PM   #3
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this was from just a few days ago. I just put the lift on.
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Old 07-01-2013, 10:19 PM   #4
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What systems does the Flashcal tap into? Does it/did it change any parameters for the speedo?

It could be that the computer is still calculating for stock tires. Is the indicated speed correct?
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Old 07-02-2013, 05:58 AM   #5
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Originally Posted by Rtone1583 View Post
What systems does the Flashcal tap into? Does it/did it change any parameters for the speedo?

It could be that the computer is still calculating for stock tires. Is the indicated speed correct?
well according to the speed on the Navigation system, it matches the speed on the speedo. The flashcal supposedly adjusted the shift points of the auto transmission to compensate for the larger tires.
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Old 07-02-2013, 07:25 AM   #6
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well according to the speed on the Navigation system, it matches the speed on the speedo. The flashcal supposedly adjusted the shift points of the auto transmission to compensate for the larger tires.
Just an FYI, I was told here that the speed on the GPS is taken from the speedo, so if your speedo is off then your GPS will be too.
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Old 07-02-2013, 07:26 AM   #7
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the nav speed indicator isn't tied to the speedometer in the car, it's calculated by measuring speed and distance using the GPS.

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