[844PHW]

The emerging picture with my XC40 T3 is that mpg is slightly better than my previous XC60 D3 (although you have to look closely to notice). Now Volvo recommend that you use Premium Grade petrol to get the best from the engine. This however is more expensive than Diesel, so in money terms the XC40 is costing me more to run than the XC60. The obvious question is why not use regular petrol which would turn in a noticeable saving (unless it dramatically reduced mpg)? Any thoughts on the matter would be much appreciated.