I would agree that the MTE is not exact, and I have seen some in other vehicles drastically change due to the current style of driving, trying to "estimate" how long you have.
Also I can see it purposely set lower, so that you will get gas and not let it run out....
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¡ɹǝʌo ǝɯ dıןɟ 'sıɥʇ pɐǝɹ uɐɔ noʎ ɟı
1994 YJ - 2.5" RC lift, 31x10.5 BFG AT
Hers - '07 XK