Instantaneous mpg when it is first reset doesn't mean you'd actually achieve said mpg at the end of the specified distance, sure at exactly 70 mph it may display 23-24 mpg if you reset the computer while drafting/ at steady state for a moment, before it calculates enough fuel and distance has gone through to get a more accurate reading, per the epa as referenced earlier the expected highway average is only 20mpg, therefore that would be a better estimate, (and the combined figure better still as that more accurately reflects 55% city and 45% highway cycle)
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