Until recently my daily commute was school run of 3 miles each way, twice a day. This usually had a 10 - 15 min break between each school journey so engine was going through its cold start process.
Roughly twice a week I'd travel to the nearest town approx 10 miles away.
Roughly once a month I'd travel to inlaws approx 80 miles away.
During this time I never had an issue with DPF however fuel consumption (excluding long journey) was little better than 28mpg according to dashboard.
My daily school run commute has now increased to 11 miles each way, again with a 10 -15 min break between each journey. Fuel consumption improved to 34mpg on very worn tyres and now 31 - 32 mpg on brand new tyres.
My 3 year old XC90 has now done 41,500 miles from new on Shell or Shell Optimax for 99.9% of the time and premium diesel from BP, Total etc when Shell not available, NEVER on supermarket diesel.
Hope the above helps.
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