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Car should have a Fuel MPG indicator. Pressing the stalk sticking out of the instrument panel between the speedo and fuel gauge gives:
ODO > TRIP > TRIP MPG. Reset trip by pressing and holding until reset. This will also reset the TRIP MPG too. Rotating the stalk will dim / brighten the instrument panel.
There is only trip MPG from memory, no average this ,or average that, or other stats.