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junker, the backlight does turn off after a timeout period. The default is set to 7 minutes, and you can change it in the same menu that you change the VSS and microsec/gallon settings. I changed mine to 3 minutes (18000000 ms).
There are also a few different brightness settings that you can scroll through while the mpguino is running by pressing the center button. The values can be changed in the code, or you can try the default values and see how well they work, because it varies with different LCD's.
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