It's high - but it actually is. I basically drive across country at 55mph for about 6 miles, then onto motorways (unobstructed, quiet ones) at motorway speed for 45 miles. My office is just off the motorway The car doesn't get used for around-town work at all, just hacking back and forth each day.
Sometimes the average is slightly higher! Depends on how free-flowing everything is.
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