[Tannaton]

Don't forget to shave off around 10% for AWD cars.

A healthy 185 D5 AWD XC70 Auto will do around 33 mpg on the motorway, i.r.o. 28 for 50/50 mix.

Tyres are a factor too - heavier 4x4 and winter tyres can shave 5-10% as well.

I really don't know why it's so poor - my 2008 XC70 does 1-2 mpg LESS than my 2003 XC90 in the same driving. My dads 2013 XC70 (215 - twin turbo) does much better - over 40 on a good run.