I've researched this a bit more. Taking the fuel consumption data listed in the official Volvo Owners Manual (don't know why I didn't do this earlier) and converting all the 'Litres per 100km' to MPG, the figures achieved by my car are all within the official range.
Incidentally, on a recent 370-mile round trip involving a mix of motoring I did an accurate fill-to-fill fuel consumption check. I came up with an 'actual' consumption of 38.6mpg, compared with a dash instrument reading of 38.4mpg. So the dash reading is accurate enough.
Thanks for the replies, all.
Stan.
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