I have a question regarding my new IS200t. After refueling the owner’s manual says something about resetting, but it doesn’t seem to explain how to actually reset the data and keep historical fuel consumption. How is that done?

 

On your instrument panel.

Toggle to your Information tab. (For the FSPORT cluster, you can skip this step)
Click arrow key down to go 1 page down, and you will see your average mpg.
Hold the center "dot" button on the arrow key pad on the steering wheel. Press and hold for 2-3 seconds.

That should reset your average MPG. For the best and most accurate information, you should reset it ever single time you get a new tank of gas.

 

Thanks, I'll try that.

 

There are three fuel economy settings that can be displayed. The information display does a poor job of making these clear and how to adjust which ones show on which screen. There are essentially 3 fuel consumption values it records:

1. Trip - Since the vehicle was started.
2. Refuel - Since the vehicle was last refueled.
3. Since reset - Since the consumption value was last manually reset. Holding the "dot" as @nathantse pointed out will reset this one.