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Just run a convert on L/100KM to MPG and see if the number matches US gallons when you switch between the two.
Or you can just tell us what MPG you're getting and we'll be able to guess.
I did a quick check on my Canadian model RX350, and it appears to show
Imperial mpg. 10.4 L/100km displays as 27.2 mpg, which according to the
online calculator I checked should be imperial mpg.