MPG?

Hi. I'm a newby to the site/club, having had 3 1.0 Micras in the past. I've just acquired a splendid 1.6 convertible (2006) with just 44k and one owner. My question is whether the indicated mpg on the dash is reliable? Around town in Bristol it's showing above 40 mpg, and today's run up the M4 to Marlborough reached 61mpg before dropping back to high 50's. Surely this isn't right, is it? Admittedly a very light-footed driver, but even so.... Any one else had similar, or is my computer crazy. (I'm not complaining, by the way!)
 
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