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Have just driven back down from Scotland to Surrey in 2 stages of 150 and 250 miles, the last stage gave 49 mpg whilst the overall trip was 48.7 mpg.
Cruising at around 70 mph using either auto/manual or cruise control I found that driving in manual mode I was able to achieve the better economy figures. One thing I did notice was that when comparing computed averages to calculated averages on a tank to tank basis, the calculated was always less (as we all know). However in my case with 2000 miles on the clock, the percentage error is not constant. It will be interesting to see how this pans in a few months time.
Ramsay
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