Many will buy the V60 on a company car scheme, so the low CO2 emissions of the diesels will likely appeal. MPG figures for both diesel models sit as high as 62.8mpg on the combined figure, and as mentioned above are barely affected by the choice of transmission. CO2 emissions also dip below 120g/km, usefully putting them into a low tax bracket.
Petrol models unfortunately have a huge drop in MPG, with the T4 and T5 managing 37.9mpg and 32.9mpg respectively. T8 models have yet to be homologated for the UK cycle, but expect a big MPG number thanks to the plug-in element of the powertrain, which is impossible to match unless you drive for a majority of the time in EV mode.