Thats EXACTLY what my question was. Thanks for clarifing.
Ive never seen mine go to that extreme. 675MPG (LOL) , but when it says 15. 8 in town, or 19.5 on the highway average before, then after the chip install it goes to 16.5 in town and 20.4 on the highway......, I was just curious as to what effect the chip has on the trip computer.
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