I have only dealt with the six button type and to change its temp reading, there are some dials on the back that change how it displays the time and temp. Would 'assume' it was the same for the others with more buttons.
The bottom right side on the front has a pin hole, stick a paper clip in it and while doing that hit the mpg button until it is what you want. There is 3 options, MPG, M/G, and Liter. Not sure what the diff is between MPG and M/G, I always use MPG. The temp should follow when you get mpg set.
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