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As far was I know, there is no option to switch real time mpg to actual numbers instead of the bar. I wish Lexus has these types of features and customization.
I have this feature on my 2010 RAV4 V6. When you floor it from a stop, it'll show maybe 5mpg and then coasting downhill, foot off the gas, it goes to 99mpg. Other than amusement value, never found much use for it!